SiSTEM Periodik Unsur

The question mentions the Law of Triads by Dobereiner, which states that elements with similar chemical properties can be grouped into triads based on their atomic weights. In this case, elements X and Z have atomic weights of 7 and 39 respectively. To find the atomic weight of element Y, we need to find the average of the atomic weights of X and Z. (7 + 39) / 2 = 23. Therefore, the atomic weight of element Y is 23.

The correct answer is "Terletak dalam golongan IIA". This is because both 20Ca (Calcium) and 38Sr (Strontium) belong to Group IIA in the periodic table, which is the alkaline earth metals group. They have similar chemical properties and share the same number of valence electrons, which makes them part of the same group.

Oksidasinya bersifat asam tidak termasuk sifat-sifat logam. Sifat-sifat logam yang umum meliputi kerapatan tinggi, bersifat konduktor, mengkilap, dan dapat ditempa. Oksidasi logam umumnya bersifat basa, tidak asam.

The Newlands octaves law is a classification system for elements based on their atomic weights and properties. One of its weaknesses is that it does not account for the elements in the noble gas group. Noble gases have unique properties and characteristics that distinguish them from other elements, such as their low reactivity and full outer electron shells. Therefore, the Newlands octaves law fails to include the noble gases in its classification system.

The electronegativity of an element indicates its ability to attract electrons. The higher the electronegativity value, the stronger the element's ability to attract electrons. In this case, N has the highest electronegativity value of 4.0, indicating that it has the strongest ability to attract electrons compared to the other elements listed. Therefore, N is the element that most easily binds electrons.

Logam adalah unsur yang paling banyak ditemukan hingga saat ini. Unsur logam memiliki sifat konduktifitas panas dan listrik yang tinggi serta kekuatan yang kuat. Unsur logam juga memiliki berbagai kegunaan dalam kehidupan sehari-hari, seperti pembuatan peralatan elektronik, kendaraan, dan bangunan. Beberapa contoh unsur logam yang umum ditemukan adalah besi, aluminium, tembaga, dan seng.

All the elements listed in the options are nonmetals except for selenium. Nonmetals are located on the right side of the periodic table and tend to have properties opposite to those of metals. Selenium, on the other hand, is a metalloid, which means it has properties of both metals and nonmetals. Therefore, the correct answer is selenium.

The correct answer is "Banyaknya lintasan elektron yang dimiliki oleh atom unsur yang bersangkutan." This is because the period in the periodic table represents the number of electron shells or energy levels that an atom of the element has. Each period corresponds to the number of shells an atom has, with the first period having only one shell and subsequent periods having more shells.

The element with the highest ionization energy among the given options is F (Fluorine). Ionization energy refers to the energy required to remove an electron from an atom or ion in the gaseous state. Fluorine has the highest ionization energy because it has the smallest atomic radius among the elements listed. The smaller the atomic radius, the stronger the attraction between the nucleus and the electrons, making it more difficult to remove an electron.

The correct answer is F (Fluorine). Fluorine has the smallest atomic radius compared to the other elements listed. This is because fluorine has the highest effective nuclear charge (the attractive force between the positively charged nucleus and the negatively charged electrons), which pulls the electrons closer to the nucleus, resulting in a smaller atomic radius.