1) CaCO3 - Ca^2+ - valency 2, CO3^2- - valency 22) Li2O - Li^+ - valency 1, O^2- - valency 23) H3PO4 - H^+ - valency 1, PO4^3- - valency 34) BaCl2 - Ba^2+ - valency 2, Cl^- - valency 15) NiF2 - Ni^2+ - valency 2, F^- - valency 1
1) CaCO3 - Ca^2+ - valency 2, CO3^2- - valency 2
2) Li2O - Li^+ - valency 1, O^2- - valency 2
3) H3PO4 - H^+ - valency 1, PO4^3- - valency 3
4) BaCl2 - Ba^2+ - valency 2, Cl^- - valency 1
5) NiF2 - Ni^2+ - valency 2, F^- - valency 1