Question

What is the formula of a hydrogen molecule?

Answer 1

Hydrogen forms the `H_2` molecule.

Explanation:

Most (or at least some!) elemental gases are binuclear: `N_2`, `O_2`, `F_2`, `Cl_2`. Can you think of the exceptions?

With regard to `H_2`, many chemists speak of `"dihydrogen"` to indicate the molecule.