What does the term diatomic molecule mean

definition of diatomic - Diatomic molecules or molecules made of two atoms chemically bonded together. The atoms can be of the same element (homonuclear molecules) or different elements (heteronuclear molecules)

"Diatomic molecules" are molecules with only two atoms of the same or different chemical elements.

Explanation:

The "di" in the word is Greek and it means "two".

homonuclear: consists of two atoms of the same element. example is H₂ and O₂

heteronuclear: consists of two different atoms. example is CO and NO