Is helium a diatomic nonmetal

Answer 1

No, helium is not a diatomic nonmetal. The element helium, like its cousins in Group 18 of the Periodic Table of the elements, is a monatomic nonmetal.

We know helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Ra) comprise those elements that we call the inert or noble gases. They generally don't want to chemically combine with other elements, and they don't want to hang out even with atoms of their own kind. These gases (and they are all gases at anything close to room temperature) are found as individual atoms, which gives rise to the moniker monatomic (which translates into "single atom") gas.