# From the first 20 elements, can you name an element made up of diatomic molecules with a single bond between the atoms?

Among the first 20 elements, hydrogen gas $\left(\text{H"_2}\right)$, fluorine gas $\left(\text{F"_2}\right)$, chlorine gas $\left(\text{Cl"_2}\right)$ are made up of diatomic molecules with a single bond between the atoms.
Hydrogen gas: $\left(\text{H":"H}\right)$
Fluorine gas: $\left(\text{F":"F}\right)$
Chlorine gas: $\left(\text{Cl":"Cl}\right)$