Chapter 4 Test - Chemistry
- 1.
An element that is very reactive gas is most likely a member of the
- A.
Alkali metals
- B.
Noble gases
- C.
Halogens
- D.
Actinides
Correct Answer
C. HalogensExplanation
Halogens are a group of elements in the periodic table that are highly reactive gases. They include elements such as fluorine, chlorine, bromine, iodine, and astatine. These elements have a tendency to gain one electron to achieve a stable electron configuration, making them highly reactive. This reactivity is due to their high electronegativity and the presence of seven valence electrons in their outermost energy level. Therefore, an element that is a very reactive gas is most likely a member of the halogens.Rate this question:
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- 2.
Which statement is true?
- A.
Alkali metals are generally found in their uncombined form.
- B.
Alkali metals are Group 1 elements.
- C.
Alkali metals should be stored under water.
- D.
Alkali metals are unreactive.
Correct Answer
B. Alkali metals are Group 1 elements.Explanation
The statement "Alkali metals are Group 1 elements" is true. Alkali metals are located in Group 1 of the periodic table, which includes elements such as lithium, sodium, and potassium. They are known for their low melting points, high reactivity, and ability to form alkaline solutions when they react with water. Therefore, this statement accurately describes the classification of alkali metals in the periodic table.Rate this question:
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- 3.
Which statement about the Periodic Table is NOT true?
- A.
There are more metals than nonmetals.
- B.
The metalloids are located in Groups 13 through 16.
- C.
The elements at the far left of the table are nonmetals.
- D.
Elements arearranged by increasing atomic number.
Correct Answer
B. The metalloids are located in Groups 13 through 16.Explanation
The statement "The metalloids are located in Groups 13 through 16" is not true. Metalloids are actually located in a diagonal strip between metals and nonmetals on the Periodic Table. They are found in Groups 13, 14, 15, 16, and 17, not just Groups 13 through 16.Rate this question:
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- 4.
Which of the following is a true statement about elements?
- A.
Every element occurs naturally.
- B.
All elements are found in their uncombined form in nature.
- C.
Each element has a unique atomic nature.
- D.
All of the elements exist in approximately equal amounts.
Correct Answer
C. Each element has a unique atomic nature.Explanation
The statement "Each element has a unique atomic nature" is true because each element is characterized by its atomic number, which represents the number of protons in its nucleus. This atomic number determines the element's unique properties, such as its chemical behavior and physical characteristics. Additionally, elements are defined by the number of protons in their atoms, and any change in the number of protons would result in a different element. Therefore, each element has its own distinct atomic nature.Rate this question:
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- 5.
Which of the following is NOT found on the Periodic Table?
- A.
The atomic number of each element
- B.
The symbol of each element
- C.
The density of each element
- D.
The atomic mass of each element
Correct Answer
D. The atomic mass of each elementExplanation
The atomic mass of each element is not found on the Periodic Table. The Periodic Table provides information about the atomic number, symbol, and density of each element, but not the atomic mass. The atomic mass of an element is a decimal value that represents the average mass of all the isotopes of that element, taking into account their abundance. This value can vary slightly depending on the isotopic composition of the element, which is why it is not included in the Periodic Table.Rate this question:
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- 6.
The element _____________ is a metalloid.
- A.
Silicon, Si
- B.
Carbon, C
- C.
Lead, Pb
- D.
Phosphorus, P
Correct Answer
A. Silicon, SiExplanation
Silicon, Si, is a metalloid because it exhibits properties of both metals and nonmetals. It is a semiconductor, meaning it can conduct electricity under certain conditions but not as well as a metal. Silicon also has a shiny appearance like a metal, but it is brittle like a nonmetal. Additionally, silicon forms covalent bonds with other elements, similar to nonmetals. These characteristics classify silicon as a metalloid.Rate this question:
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- 7.
In his gold foil experiment, Rutherford concluded that the atom is mostly empty space with a small, massive, positively charged center because
- A.
Most of the particles passed straight through the foil.
- B.
Some particles were slightly deflected.
- C.
A few particles bounced back.
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
Rutherford concluded that the atom is mostly empty space with a small, massive, positively charged center because most of the particles passed straight through the foil, some particles were slightly deflected, and a few particles bounced back. These results indicated that the positive charge and mass of the atom were concentrated in a small region, which he called the nucleus, while the majority of the atom was empty space.Rate this question:
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- 8.
How many protons does an atom with an atomic number of 23 and a mass number of 51 have?
- A.
23
- B.
28
- C.
51
- D.
74
Correct Answer
A. 23Explanation
The atomic number of an atom represents the number of protons it has. In this case, the atom has an atomic number of 23, which means it has 23 protons. The mass number, on the other hand, represents the sum of protons and neutrons in the atom's nucleus. However, the question specifically asks for the number of protons, so the correct answer is 23.Rate this question:
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- 9.
An atom has no overall charge if it contains equal numbers of
- A.
Electrons and protons.
- B.
Neutrons and protons.
- C.
Neutrons and electrons.
- D.
None of the above
Correct Answer
A. Electrons and protons.Explanation
An atom has no overall charge if it contains equal numbers of electrons and protons. Electrons are negatively charged particles, while protons are positively charged particles. The charges of electrons and protons cancel each other out, resulting in a neutral atom with no overall charge. Neutrons, on the other hand, are electrically neutral particles and do not contribute to the overall charge of an atom. Therefore, the correct answer is electrons and protons.Rate this question:
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- 10.
Which statement about neutrons is true?
- A.
Neutrons have a mass of 1 amu.
- B.
Neutrons circle the nucleus of an atom.
- C.
Neutrons are the only particles that make up the nucleus.
- D.
Neutrons have a negative charge.
Correct Answer
A. Neutrons have a mass of 1 amu.Explanation
Neutrons have a mass of 1 amu. This is true because neutrons are subatomic particles that are found in the nucleus of an atom. They have a mass that is close to, but slightly greater than, the mass of a proton. The atomic mass unit (amu) is a unit of measurement used to express the mass of atomic and subatomic particles. Therefore, it is accurate to say that neutrons have a mass of 1 amu.Rate this question:
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- 11.
Which of the following determines the identity of an element?
- A.
Atomic number
- B.
Mass number
- C.
Atomic mass
- D.
Overall charge
Correct Answer
A. Atomic numberExplanation
The atomic number of an element determines its identity. It represents the number of protons in the nucleus of an atom, which is unique to each element. The atomic number is what distinguishes one element from another and determines its position on the periodic table. The mass number and atomic mass are related to the mass of an atom, but they do not determine the identity of the element. The overall charge of an atom can vary due to the presence of electrons, but it also does not determine the identity of the element.Rate this question:
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- 12.
Isotopes exist because atoms of the same element can have different numbers of
- A.
Protons.
- B.
Neutrons.
- C.
Electrons.
- D.
None of the above
Correct Answer
B. Neutrons.Explanation
Isotopes exist because atoms of the same element can have different numbers of neutrons. Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. This difference in neutron number results in variations in atomic mass. The number of electrons in an atom remains the same for a given element, as it determines the element's chemical properties. Therefore, the correct answer is neutrons.Rate this question:
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- 13.
In Thomson’s “plum-pudding” model of the atom, the plums represent
- A.
Atoms.
- B.
Protons.
- C.
Neutrons.
- D.
Electrons.
Correct Answer
D. Electrons.Explanation
In Thomson's "plum-pudding" model of the atom, the plums represent electrons. This model suggests that the atom is made up of a positively charged "pudding" with negatively charged electrons embedded within it, resembling plums in a pudding. This was proposed by J.J. Thomson in the early 20th century and was later replaced by the more accurate model of the atom with a nucleus containing protons and neutrons, and electrons orbiting around it.Rate this question:
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- 14.
An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of
- A.
39.
- B.
158.
- C.
197.
- D.
276.
Correct Answer
C. 197.Explanation
The mass number of an atom is the sum of its protons and neutrons. In this case, the gold atom has 79 protons and 118 neutrons, so the mass number would be 79 + 118 = 197.Rate this question:
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- 15.
Which of the following has the LEAST mass?
- A.
Nucleus
- B.
Proton
- C.
Neutron
- D.
Electron
Correct Answer
D. ElectronExplanation
The electron has the least mass compared to the other options. Electrons are subatomic particles that orbit the nucleus of an atom. They have a very small mass, approximately 1/1836th the mass of a proton or neutron. Protons and neutrons are found in the nucleus of an atom and have a much larger mass compared to electrons. Therefore, the electron has the least mass among the given options.Rate this question:
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- 16.
The isotope of uranium used in nuclear reactors, uranium-235, contains 92 protons. Another isotope, uranium-238, contains ____ electrons.
- A.
92
- B.
95
- C.
143
- D.
146
Correct Answer
A. 92Explanation
Uranium-235 contains 92 protons, which determines its atomic number. The atomic number also represents the number of electrons in an atom when it is neutral. Therefore, uranium-238, being another isotope of uranium, would also contain 92 electrons.Rate this question:
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- 17.
Thomson's model of the atom resembled
- A.
Chocolate-chip ice cream.
- B.
Gelatin.
- C.
The solar system.
- D.
A balloon.
Correct Answer
A. Chocolate-chip ice cream. -
- 18.
Who performed an experiment proving the existence of an atomic nucleus?
- A.
Thomson
- B.
Dalton
- C.
Democritus
- D.
Rutherford
Correct Answer
D. RutherfordExplanation
Rutherford performed the famous gold foil experiment in 1911, which provided evidence for the existence of an atomic nucleus. In this experiment, he directed a beam of alpha particles at a thin gold foil and observed that some particles were deflected at large angles or even bounced back. This unexpected result led Rutherford to conclude that atoms have a small, dense, and positively charged nucleus at their center, which contains most of the mass of the atom. This experiment revolutionized our understanding of atomic structure and established Rutherford as the scientist who proved the existence of an atomic nucleus.Rate this question:
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- 19.
The current model of the atom suggests that
- A.
Electron clouds surround the nucleus.
- B.
Proton clouds surround the nucleus.
- C.
Electrons travel in definite paths around the nucleus.
- D.
The exact path of a moving electron can be predicted.
Correct Answer
A. Electron clouds surround the nucleus.Explanation
The current model of the atom suggests that electron clouds surround the nucleus. This is based on the concept of electron probability distribution, where electrons are more likely to be found in certain regions around the nucleus. The electron cloud model allows for the understanding of electron behavior and the formation of chemical bonds. It also explains phenomena such as electron energy levels and electron interactions. This model replaces the older idea of electrons traveling in definite paths around the nucleus, as it is now understood that the exact path of a moving electron cannot be predicted.Rate this question:
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- 20.
The size of atoms
- A.
Are exactly the same.
- B.
Vary widely.
- C.
Vary only a little bit.
- D.
Cannot be measured.
Correct Answer
B. Vary widely.Explanation
Atoms vary widely in size. This is because atoms are made up of different elements, and each element has a different number of protons, neutrons, and electrons. The size of an atom is determined by the arrangement of these particles and the overall size of the nucleus. Some atoms, like hydrogen, are very small, while others, like uranium, are much larger. Therefore, the size of atoms can vary greatly depending on the element they belong to.Rate this question:
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- 21.
Atoms are composed of
- A.
Electrons and neutrons.
- B.
Protons and neutrons.
- C.
Electrons, protons, and neutrons.
- D.
Atomic mass units.
Correct Answer
C. Electrons, protons, and neutrons.Explanation
Atoms are composed of electrons, protons, and neutrons. Electrons are negatively charged particles that orbit the nucleus of an atom. Protons are positively charged particles located in the nucleus, while neutrons are neutral particles also found in the nucleus. These three subatomic particles make up the structure of an atom and determine its properties and behavior.Rate this question:
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- 22.
What particles make up a nucleus?
- A.
Electrons and neutrons
- B.
Neutrons
- C.
Protons and neutrons
- D.
Electrons, protons, and neutrons
Correct Answer
C. Protons and neutronsExplanation
The particles that make up a nucleus are protons and neutrons. Electrons are not present in the nucleus, but instead orbit around it in electron shells. The protons have a positive charge and the neutrons have no charge, and together they form the dense core of an atom.Rate this question:
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- 23.
Neutrons are particles that
- A.
Help make up the nucleus and have no charge.
- B.
Help make up the nucleus and are positively charged.
- C.
Are located outside of the nucleus and are negatively charged.
- D.
Are located outside of the nucleus and have no charge.
Correct Answer
A. Help make up the nucleus and have no charge.Explanation
Neutrons are particles that help make up the nucleus of an atom. They have no charge, unlike protons which are positively charged and electrons which are negatively charged. Neutrons play a crucial role in stabilizing the nucleus and determining the isotope of an atom. Their neutral charge allows them to interact with both protons and electrons, contributing to the overall stability of the atom.Rate this question:
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- 24.
Electrons are particles that
- A.
Help make up the nucleus and are negatively charged.
- B.
Help make up the nucleus and are positively charged.
- C.
Are located outside of the nucleus and are negatively charged.
- D.
Are located outside of the nucleus and have no charge.
Correct Answer
C. Are located outside of the nucleus and are negatively charged.Explanation
Electrons are subatomic particles that orbit the nucleus of an atom. They have a negative charge and are essential for the stability of an atom. The statement "are located outside of the nucleus and are negatively charged" accurately describes the properties and behavior of electrons in an atom.Rate this question:
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- 25.
An atom becomes an ion when
- A.
There are equal numbers of protons and electrons.
- B.
There are equal numbers of protons, neutrons, and electrons.
- C.
There are unequal numbers of protons and electrons.
- D.
None of the above
Correct Answer
C. There are unequal numbers of protons and electrons.Explanation
An atom becomes an ion when there are unequal numbers of protons and electrons. This is because ions are formed when an atom gains or loses electrons, resulting in a difference in the number of protons and electrons. If an atom gains electrons, it becomes negatively charged and forms a negative ion (anion), while if it loses electrons, it becomes positively charged and forms a positive ion (cation). Therefore, the correct answer is that there are unequal numbers of protons and electrons.Rate this question:
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- 26.
Which of the following statements describes isotopes?
- A.
Isotopes are atoms of the same element.
- B.
Isotopes have the same number of protons but have different numbers of neutrons.
- C.
Isotopes have the same atomic number but have different mass numbers.
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. This means that they have the same atomic number but different mass numbers. Therefore, all of the statements provided in the options are correct and describe isotopes.Rate this question:
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- 27.
If a boron atom has 5 protons, 6 neutrons, and 5 electrons, it has a mass number of
- A.
11.
- B.
10.
- C.
6.
- D.
5.
Correct Answer
A. 11.Explanation
The mass number of an atom is determined by the sum of its protons and neutrons. In this case, the boron atom has 5 protons and 6 neutrons, so the total number of particles in the nucleus is 11. Therefore, the correct answer is 11.Rate this question:
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- 28.
Atoms that are isotopes of each other
- A.
Are the same element.
- B.
Are different elements.
- C.
Have different charges.
- D.
Have different properties.
Correct Answer
A. Are the same element.Explanation
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. This means that they have the same atomic number and chemical properties. The only difference between isotopes is their atomic mass. Therefore, atoms that are isotopes of each other are still the same element.Rate this question:
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- 29.
How can you distinguish between isotopes?
- A.
Look at the atomic number.
- B.
Look at the number of protons.
- C.
Look at the mass number.
- D.
All of the above
Correct Answer
C. Look at the mass number.Explanation
Isotopes are atoms of the same element that have different numbers of neutrons, resulting in different mass numbers. The mass number is the sum of the number of protons and neutrons in an atom. Therefore, by looking at the mass number, one can distinguish between isotopes. The atomic number only gives information about the number of protons, which is the same for all isotopes of an element.Rate this question:
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- 30.
Atomic mass is calculated by finding the
- A.
Sum of the masses of all the isotopes of an element.
- B.
Sum of the masses of all the naturally occurring isotopes of an element.
- C.
Weighted average of the masses of the radioactive isotopes of an element.
- D.
Weighted average of the masses of all the naturally occurring isotopes of an element.
Correct Answer
D. Weighted average of the masses of all the naturally occurring isotopes of an element.Explanation
Atomic mass is calculated by finding the weighted average of the masses of all the naturally occurring isotopes of an element. This means that the atomic mass takes into account the abundance (or frequency) of each isotope in nature. Isotopes are variants of an element that have the same number of protons but different numbers of neutrons. Since different isotopes of an element have different masses, their contribution to the overall atomic mass is weighted based on their abundance. Therefore, the atomic mass represents the average mass of all the isotopes of an element found in nature.Rate this question:
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- 31.
An atom of oxygen with 8 protons, 8 electrons, and 8 neutrons would have a mass number of
- A.
4
- B.
8
- C.
16
- D.
24
Correct Answer
C. 16Explanation
The mass number of an atom is the sum of its protons and neutrons. In this case, the atom of oxygen has 8 protons and 8 neutrons, so the mass number would be 8 + 8 = 16.Rate this question:
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- 32.
A lithium atom has 3 protons, 3 neutrons, and 3 electrons. Which of the following sets of particles represents an isotope of this atom?
- A.
4 protons, 3 neutrons, and 4 electrons
- B.
3 protons, 4 neutrons, and 3 electrons
- C.
3 protons, 3 neutrons, and 2 electrons
- D.
4 protons, 4 neutrons, and 4 electrons
Correct Answer
B. 3 protons, 4 neutrons, and 3 electronsExplanation
An isotope is a variant of an element that has the same number of protons but a different number of neutrons. In this case, the correct answer is 3 protons, 4 neutrons, and 3 electrons because it has the same number of protons as a lithium atom (3) but differs in the number of neutrons (3 instead of 4) while maintaining the same number of electrons (3). This makes it an isotope of lithium.Rate this question:
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- 33.
Which of the following sets of particles represents an ion?
- A.
19 protons, 19 neutrons, and 19 electrons
- B.
20 protons, 19 neutrons, and 20 electrons
- C.
19 protons, 20 neutrons, and 19 electrons
- D.
19 protons, 19 neutrons, and 18 electrons
Correct Answer
D. 19 protons, 19 neutrons, and 18 electronsExplanation
An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a positive or negative charge. In the given sets of particles, the only set that represents an ion is 19 protons, 19 neutrons, and 18 electrons. This is because the number of electrons is less than the number of protons, indicating that one electron has been lost, resulting in a positive charge.Rate this question:
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- 34.
An atom of aluminum-27 will have all of the following EXCEPT
- A.
13 protons.
- B.
13 neutrons.
- C.
13 electrons.
- D.
An atomic number of 13.
Correct Answer
B. 13 neutrons.Explanation
An atom of aluminum-27 will have 13 protons, 13 electrons, and an atomic number of 13 because the atomic number is determined by the number of protons in an atom. However, the number of neutrons can vary in different isotopes of an element. Aluminum-27 is an isotope of aluminum, and it has 13 protons and 14 neutrons, not 13 neutrons.Rate this question:
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- 35.
Which of the following is NOT found on the periodic table?
- A.
The atomic number of each element
- B.
The symbol of each element
- C.
The density of each element
- D.
The atomic mass of each element
Correct Answer
C. The density of each elementExplanation
The periodic table provides information about the atomic number, symbol, and atomic mass of each element. However, it does not include the density of each element. Density is a physical property of matter and can vary depending on the conditions. Therefore, it is not a fixed characteristic of an element and is not included on the periodic table.Rate this question:
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- 36.
Most of the elements in the periodic table are
- A.
Classified as metals
- B.
Metalloids.
- C.
Poor conductors of electric current.
- D.
Nonmetals.
Correct Answer
A. Classified as metalsExplanation
The majority of elements in the periodic table are classified as metals. Metals are typically shiny, malleable, and good conductors of heat and electricity. They are found on the left side and in the middle of the periodic table. Nonmetals, on the other hand, are poor conductors of heat and electricity and are found on the right side of the periodic table. Metalloids are elements that have properties that are intermediate between metals and nonmetals. Therefore, the correct answer is that most elements in the periodic table are classified as metals.Rate this question:
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- 37.
Alkaline-earth metals ____ than alkali metals.
- A.
Are more reactive
- B.
Have greater density
- C.
Have lower atomic numbers
- D.
Are more explosive
Correct Answer
B. Have greater densityExplanation
Alkaline-earth metals have greater density than alkali metals because they have a higher atomic mass and more closely packed atoms in their crystal lattice structure. This results in a higher mass per unit volume, leading to a greater density.Rate this question:
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- 38.
Each square on the periodic table includes an element's
- A.
Name, chemical symbol, and mass number.
- B.
Name, chemical symbol, and ion number.
- C.
Chemical symbol, mass number, and atomic mass.
- D.
Name, chemical symbol, atomic number, and atomic mass.
Correct Answer
D. Name, chemical symbol, atomic number, and atomic mass.Explanation
Each square on the periodic table includes the name of the element, its chemical symbol, its atomic number, and its atomic mass. The name of the element allows us to identify it, while the chemical symbol provides a shorthand representation. The atomic number indicates the number of protons in the nucleus of an atom, which determines the element's identity. The atomic mass represents the average mass of all the isotopes of the element, taking into account their abundance. Therefore, the correct answer is name, chemical symbol, atomic number, and atomic mass.Rate this question:
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- 39.
On the periodic table, a row of elements is called a(n)
- A.
Atomic line.
- B.
Period.
- C.
Group.
- D.
Family.
Correct Answer
B. Period.Explanation
On the periodic table, a row of elements is called a period. Periods are horizontal rows that represent the arrangement of elements based on their atomic number. Each period corresponds to a specific energy level or shell in which the electrons of the elements are arranged. The elements within a period have similar properties and exhibit a gradual change in properties as you move across the period from left to right. Therefore, the term "period" accurately describes a row of elements on the periodic table.Rate this question:
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- 40.
On the periodic table, a column of elements is called
- A.
An atomic line.
- B.
A period.
- C.
A group or family.
- D.
A transition.
Correct Answer
C. A group or family.Explanation
On the periodic table, a column of elements is called a group or family. This is because elements within the same group or family share similar chemical properties and have the same number of valence electrons. The elements in a group or family also tend to have similar reactivity patterns and form similar types of compounds. Therefore, grouping elements together in columns helps to organize and classify them based on their similarities, making it easier to study and understand their properties and behaviors.Rate this question:
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- 41.
In the periodic table, elements are classified as ____ according to their properties.
- A.
Solid, liquid, or gas
- B.
Neutral or ionized
- C.
Metals, nonmetals, and metalloids
- D.
Bondable or not bondable
Correct Answer
C. Metals, nonmetals, and metalloidsExplanation
In the periodic table, elements are classified as metals, nonmetals, and metalloids according to their properties. This classification is based on various characteristics such as their physical state, chemical behavior, and ability to conduct electricity. Metals are typically solid, shiny, and good conductors of heat and electricity. Nonmetals, on the other hand, can be solid, liquid, or gas, and they are generally poor conductors of heat and electricity. Metalloids exhibit properties that are intermediate between metals and nonmetals, making them semi-conductors. This classification helps in organizing and understanding the properties and behavior of elements in a systematic manner.Rate this question:
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- 42.
Which of the following metals is most reactive?
- A.
Lithium (Li)
- B.
Calcium (Ca)
- C.
Titanium (Ti)
- D.
All metals have the same reactivity.
Correct Answer
A. Lithium (Li)Explanation
Lithium (Li) is the most reactive metal among the given options. This is because it belongs to Group 1 of the periodic table, known as the alkali metals, which are highly reactive due to their low ionization energies. Lithium has the lowest ionization energy among the options, meaning it requires the least amount of energy to remove an electron and form a positive ion. This high reactivity makes lithium more likely to readily react with other elements or compounds compared to calcium (Ca) and titanium (Ti), which are less reactive.Rate this question:
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- 43.
Most metals are good conductors of
- A.
Thermal energy.
- B.
Electric current.
- C.
Light energy.
- D.
Both (a) and (b)
Correct Answer
D. Both (a) and (b)Explanation
Metals are good conductors of both thermal energy and electric current. This is due to the presence of free electrons in the metal's atomic structure. These free electrons can easily move through the metal, allowing for the transfer of both heat and electricity. Therefore, the correct answer is both (a) and (b).Rate this question:
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- 44.
The wires in your home's electrical devices demonstrate a metal's property of
- A.
Conductivity.
- B.
Malleability.
- C.
Ductility.
- D.
Both (a) and (b)
Correct Answer
D. Both (a) and (b)Explanation
The wires in your home's electrical devices demonstrate a metal's property of conductivity because they allow the flow of electric current. They also demonstrate the property of malleability because they can be easily shaped or bent without breaking. Therefore, the correct answer is "Both (a) and (b)".Rate this question:
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- 45.
An iron griddle can cook your favorite foods on a stove because it has high thermal
- A.
Conductivity.
- B.
Malleability.
- C.
Ductility.
- D.
Reflectivity.
Correct Answer
A. Conductivity.Explanation
An iron griddle can cook your favorite foods on a stove because it has high thermal conductivity. This means that it is able to transfer heat quickly and efficiently from the stove to the food, allowing for even and consistent cooking. The high thermal conductivity of the iron griddle ensures that the heat is evenly distributed across its surface, resulting in evenly cooked food.Rate this question:
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- 46.
Making aluminum foil demonstrates
- A.
Conductivity.
- B.
Malleability.
- C.
Ductility.
- D.
Reflectivity.
Correct Answer
B. Malleability.Explanation
Making aluminum foil involves rolling or hammering aluminum into thin sheets. This process requires the metal to be easily shaped and flattened without breaking. Malleability refers to the ability of a material to be bent or shaped without breaking, and aluminum exhibits this property. Therefore, the correct answer is malleability.Rate this question:
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- 47.
You can see your reflection in a mirror because metals tend to be
- A.
Shiny.
- B.
Conductive.
- C.
Malleable.
- D.
Ductile.
Correct Answer
A. Shiny.Explanation
Metals tend to be shiny because they have a high reflectivity for light. When light hits the surface of a metal, it is reflected back, allowing us to see our reflection in a mirror. Shiny surfaces have a smooth and polished texture, which helps to enhance the reflection of light. Conductivity, malleability, and ductility are properties of metals but they do not directly contribute to the ability to see a reflection in a mirror.Rate this question:
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- 48.
Atoms of one group of nonmetals, the noble gases, have ____ electrons in their outer energy level.
- A.
Few
- B.
About a half-complete set of
- C.
An almost complete set of
- D.
A complete set of
Correct Answer
D. A complete set ofExplanation
Noble gases are known for their stability and lack of reactivity due to having a complete set of electrons in their outer energy level. This means that they have the maximum number of electrons allowed in that level, making it a complete set.Rate this question:
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- 49.
Which class of elements are also called semiconductors?
- A.
Metals
- B.
Nonmetals
- C.
Metalloids
- D.
Noble gases
Correct Answer
C. MetalloidsExplanation
Metalloids are a class of elements that have properties of both metals and nonmetals. They are called semiconductors because they have intermediate conductivity, meaning they can conduct electricity under certain conditions but not as well as metals. This property makes them useful in electronic devices such as transistors and diodes. Examples of metalloids include silicon, germanium, and arsenic.Rate this question:
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- 50.
Alkali metals are the most reactive of all the metals because they have ____ electron(s) in their outer energy level
- A.
1
- B.
2
- C.
7
- D.
8
Correct Answer
A. 1Explanation
Alkali metals are the most reactive of all the metals because they have 1 electron in their outer energy level. This single electron is easily lost, allowing the alkali metals to readily form positive ions and participate in chemical reactions. The low ionization energy of alkali metals is due to the electron's relatively weak attraction to the positively charged nucleus, making it easier to remove.Rate this question:
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Mar 21, 2023Quiz Edited by
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Dec 10, 2012Quiz Created by
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