The elements with atomic numbers 9, 17, 35, 53, 85 are all A. Heavy metals B. Noble gases C. Light metals D. Halogens

The correct answer is D. Halogens.

Halogens are a group of elements in the periodic table that are highly reactive and form salts with metals. They are all non-metals and have a high electronegativity. The

elements with atomic numbers 9, 17, 35, 53, and 85 are fluorine, chlorine, bromine, iodine, and astatine, respectively. All of these elements are halogens.

Heavy metals are elements that have a high atomic mass. They are often toxic and can be harmful to human health. Some examples of heavy metals include lead, mercury, and arsenic.

Noble gases are elements that are very stable and do not react with other elements. They

are all gases at room temperature and have very low reactivity. Some examples of noble gases include helium, neon, argon, krypton, and xenon.

Light metals are elements that are relatively low in atomic mass and have a low density. They are often soft and malleable. Some examples of light metals include lithium, sodium, potassium, and magnesium.