Chemistry, Third edition

Valencies of Common Ions

Name* Valency Symbol Name* Valency Symbol

Ammonium 1 NH 4 + Ethanoate or acetate 1CH 3 COO–

Copper(I) or cuprous 1Cu+ Hydrogencarbonate or bicarbonate 1 HCO 3 –

Caesium 1 Cs+ Hydrogensulfate (hydrogensulphate) 1 HSO 4 –

Potassium 1 K+ Hydrogensulfite (hydrogensulphiteorbisulphite) 1 HSO 3 –

Silver 1 Ag+ Bromide 1 Br–

Sodium 1 Na+ Bromate or bromate(V) 1 BrO 3 –

Lithium 1 Li+ Chloride 1 Cl–

Hydrogen 1 H+ Chlorate or chlorate(V) 1 ClO 3 –

Barium 2 Ba2+ Cyanide 1 CN–

Calcium 2 Ca2+ Fluoride 1 F–

Cobalt(II)2Co2+ Hydride 1 H–

Copper(II) or cupric 2Cu2+ Hydroxide 1 OH–

Iron(II) or ferrous 2Fe2+ Iodide 1 I–

Lead(II)2Pb2+ Nitrate or nitrate(V) 1NO 3 –

Magnesium 2 Mg2+ Nitrite or nitrate(III) 1NO 2 –

Mercury(II) or mercuric 2Hg2+ Manganate(VII) or permanganate 1MnO 4 –

Nickel 2 Ni2+ Carbonate 2 CO 3 2–

Strontium 2 Sr2+ Chromate or chromate(VI) 2 CrO 4 2–

Tin(II) or stannous 2Sn2+ Dichromate or dichromate(VI) 2Cr 2 O 7 2–

Zinc 2 Zn2+ Oxide 2 O2–

Aluminium 3 Al3+ Sulfide or sulphide 2S2–

Chromium (III) 3 Cr3+ Sulfite,sulfate(IV)orsulphite 2SO 3 2–

Iron(III) or ferric 3Fe3+ Sulfate,sulfate(VI)orsulphate 2SO 4 2–

Tin(IV) or stannic† 4Sn4+ Nitride 3 N3–

Phosphate 3 PO 4 3–

*Common or alternative names are shown in italics.

†Does not exist as an ion, but exhibits the valency tabulated.

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