Chromium
Cr
2 or 3
cobalt
Co
2 or 3
Copper
Cu
1 or 2
Lead
Pb
2 or 4
Tin
Sn
2 or 4
Iron
Fe
2 or 3
silver
Ag
ammonium
NH4 +
barium
Ba 2+
zinc
Zn 2+
fluoride
F -
monovalent
chloride
Cl -
monovalent
bromide
Br -
monovalent
iodide
I-
monovalent
Hydride
H-
monovalent
hyrdoxide
OH-
monovalent
nitrite
NO2-
monovalent
nitrate
NO3-
monovalent
manganate VII
MNO4-
monovalent
hyrdogensulphate
HSO4-
monovalent
hydrogencarbonate
HCO3-
monovalent
ethanoate
CH3COO-
monovalent
oxide
O 2-
divalent
sulphide
S 2-
divalent