# What is the formula of a hydrogen molecule?

Hydrogen forms the ${H}_{2}$ molecule.
Most (or at least some!) elemental gases are binuclear: ${N}_{2}$, ${O}_{2}$, ${F}_{2}$, $C {l}_{2}$. Can you think of the exceptions?
With regard to ${H}_{2}$, many chemists speak of $\text{dihydrogen}$ to indicate the molecule.