hydrogen
H+
Lithium
Li+
Sodium
Na+
Potassium
K+
Copper (I)
Cu+
SIlver
Ag+
Magnesium
Mg2+
Calcium
Ca2+
Barium
Ba2+
Iron (II)
Fe2+
Copper (II)
Cu2+
Cobalt (II)
Co2+
Lead (II)
Pb2+
Mercury (II)
Hg2+