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QUESTION

# What is the relationship between diatomic molecules and diatomic elements?

Diatomic are a subgroup of diatomic molecules.

Every molecule that consists of two atoms is diatomic. Only if the two atoms are the same there is a diatomic element.

So O_2 is a diatomic element (and thus a diatomic molecule) HCl is a diatomic molecule, but not a diatomic element.