What Do You Know About The Chemical Element Cerium?

Explanation
The atomic number of an element represents the number of protons in the nucleus of an atom. In this case, the correct answer is 58, which is the atomic number of Cerium. This means that Cerium has 58 protons in its nucleus.

Explanation
Cerium was discovered in the year 1803.

Explanation
The symbol of the chemical element cerium is Ce.

Explanation
The atomic mass of cerium is 140. This is the correct answer because the atomic mass of an element is the weighted average mass of all the isotopes of that element, taking into account their abundance. In the case of cerium, the most abundant isotope is cerium-140, which has a mass of 140 atomic mass units.

Explanation
Cerium is found in period 6 on the periodic table because the period number represents the energy level or shell in which the element's valence electrons are located. Cerium has an atomic number of 58, which means it has 58 electrons. The first two electrons are in the 1s orbital, the next two are in the 2s orbital, the next six are in the 2p orbital, and so on. By the time we reach the 6th period, cerium's valence electrons are in the 6s orbital. Therefore, cerium is found in period 6 on the periodic table.

Explanation
Cerium oxide is commonly used as a glass polishing agent due to its abrasive properties. It can effectively remove scratches and imperfections from glass surfaces, leaving them smooth and shiny. The oxide particles act as a mild abrasive, gently grinding away the damaged areas without causing further damage to the glass. This makes cerium oxide an ideal choice for polishing glass objects such as lenses, mirrors, and windows.

Explanation
Cerium reacts slowly with cold water. This means that when cerium comes into contact with cold water, it undergoes a relatively slow reaction. The reaction may not be very noticeable or vigorous, and it may take some time for the cerium to fully react with the water.

Explanation
Cerium was named after the asteroid Ceres, which was discovered in 1801.

Explanation
Cerium is classified as a rare-earth metal based on its physical and chemical properties. Rare-earth metals are a group of elements that are typically found in the Earth's crust and have similar characteristics. Cerium is a soft, silvery-white metal that is highly reactive and easily oxidized. It is commonly used in the production of catalytic converters, glass polishing, and as an alloying agent in metals. These properties align with the characteristics of rare-earth metals, making it the correct classification for cerium.

Explanation
Cerium has only one stable isotope.