Why does H2 molecules exist when He2 does not?

Answer 1

H2 technically does contain molecules. Or at least, molecule. H2 is two hydrogens covalently bonded, so that the lowest energy level is filled. Since H2 has two atoms (hydrogen and hydrogen), it is not an element, because there is more than one atom. H2 is a molecule itself. However, in context of nature, it is rare that you would ever find an H2 molecule on its own unless you were working with one in a laboratory. So, if you were considering the whole of an H2 gas, there would be many molecules of H2.

Short answer: H2 is a molecule itself. Many H2 means there are many molecules of H2.

Answer 2

H2 molecules exist because hydrogen has the ability to form stable covalent bonds by sharing electrons, which allows it to form molecules like H2. In contrast, helium is an inert gas with a full outer electron shell, making it highly stable and less likely to form bonds with other helium atoms to create He2 molecules.

Answer 3

Hydrogen molecule exists because two hydrogen atoms which are independently unstable combine to become stable but Helium is independently stable. So, it does not form a molecule.

Answer 4

hydrogen cannot exist with only 1 atom

Answer 5

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