Find the number of atoms present in an $H_{2}S$ molecule and an ${ }^{3-}P{O}_4$ion

 

In$H_{2}S$ molecule, there are two atoms of hydrogen(H) and one atom of sulphur(S)

Hence three atoms of H  and S totally present in $H_{2}S$ molecule.

In ${ }^{3-}P{O}_4$ ion, there are one atom pf phosphorus(P) and four atoms of oxygen(O) Hence Five.

Hence,the number of atoms are 3 and 5.