What molecules are diatomic?

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Answer 1 · 2018-07-02T14:30:19

All the elemental gases with any chemistry....

$H_2$ , $O_2$ , $N_2$ , $X_2(X=F, Cl)$ ...

Of course there are binuclear hydrogen halides, and interhalogens...the halogens, $X_2$ , feature gaseous, liquid, and solid states...