Question

what is meant by "diatomic molecule" ?

Answer 1

Diatomic molecules are moleculescomposed of only two atoms, of the same or different chemical elements. The prefix di- is of Greek origin,meaning "two". If a diatomic moleculeconsists of two atoms of the same element, such as hydrogen (H2) or oxygen (O2), then it is said to be homonuclear.

Answer 2

Term 'Diatomic' refers to a molecule consisting of two atoms. That means, a diatomic molecule has 2 atoms of same or different elements bound together.