Mononuclear Diatomic MoleculesSome of these molecules consist of one element or are diatomic elements. Diatomic elements are examples of homonuclear molecules, where all of the atoms in the molecule are the same.
Heteronuclear Diatomic MoleculesMany other diatomic molecules consist of two elements. In fact, most elements form diatomic molecules, particularly at higher temperatures. Past a certain temperature, however, all molecules break into their constituent atoms. The noble gases do not form diatomic molecules. Diatomic molecules consisting of two different elements are called heteronuclear molecules. Here are some heteronuclear diatomic molecules: