Homo atomic molecule from the following

A molecule containing same type of atoms is called homo atomic molecule

Ex: Nitrogen $\left({\text{N}}_2\right)$

When a molecule consists of different kind of atoms, it is called hetero atomic molecule

Ex: ${\text{H}}_{\text{2}}{\text{O,N}}_{\text{2}}{\text{O}}_{\text{3}}{\text{,FeSO}}_4$