Question

What class of elements includes all of the elements that are gases at room temperature?

A. Non Metals
B. Metals
C. Metalloids

Answer 1

The answer would be A. Nonmetals.

Answer 2

Answer is: Nonmetals - noble gases (group 18).

This question is not complete, because some nonmetals are solid (carbon, sulfur) and liquid (bromine) at room temperature.

The nonmetals are divided into two categories: reactive nonmetals and noble gases.

Noble gases are in group 18: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn). They have very low chemical reactivity.