Name any two monovalent cations, divalent cations and trivalent cations. Also name any one compound each one of them make.
Two monovalent cations: Na+ and K+
Compounds they make: NaCl and KCl
Two divalent cations: Ca2+ and Ba2+
Compounds they make: CaCl2 and BaCl2
Two trivalent cations: Al3+ and Fe3+
Compounds they make: AlCl3 and FeCl3
Note: Monovalent cations: The cations (positively charged species) which have a valency of +1 are called monovalent cations.
Divalent cations: The cations which have a valency of +2 are called divalent cations.
Trivalent cations: The cations which have a valency of +3 are called trivalent cations.