8/19/2019 Common Ion Names

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NAMES, FORMULAE AND CHARGES OF SOME COMMON IONS

POSITIVE IONS (CATIONS)

H+ hydrogen Be2+ beryllium Al3+ aluminium

Li+ lithium Mg2+  magnesium As3+ arsenic(III)

Na+ sodium Ca2+ calcium Sb3+ antimony(III)

K+ potassium Sr2+ strontium Bi3+ bismuth

Rb+ rubidium Ba2+ barium Fe3+ iron(III)

Cs+ caesium Zn2+ zinc Cr3+ chromium(III)

NH4+ ammonium   Cd2+ cadmium

Ag+ silver Ni2+ nickel

Cu+ copper(I) Co2+ cobalt

Hg22+ mercury(I)   Pb2+ lead Sn4+ tin(IV)

Fe2+ iron(II)

Mn2+ manganese(II)

Cu2+ copper(II)

Hg2+ mercury(II)

Sn2+ tin(II)

NEGATIVE IONS (ANIONS)

H – hydride   NO2 – nitrite   O2– oxide

F – fluoride ClO – hypochlorite   O22– peroxide

Cl – chloride   ClO2 – chlorite   S2– sulfide

Br –

bromide   ClO3 –

chlorate CO32–

carbonateI – iodide   ClO4

 – perchlorate C2O

42– oxalate

OH – hydroxide   IO4 – periodate SO4

2– sulfate

CH3CO

2 – ethanoate (acetate) BrO

3 – bromate SO

32– sulfite

HCO3 –  hydrogencarbonate MnO

4 – permanganate CrO

42– chromate

HSO3 – hydrogensulfite   CN – cyanide   Cr2O7

2– dichromate

HSO4 – hydrogensulfate BiO

3 – bismuthate HPO

42– monohydrogen-

phosphate

H2PO4 –

dihydrogenphosphate S2O32–

thiosulfateNO

3 – nitrate S

2O

82– persulfate

PO43– phosphate

Note:  When naming an isolated cation or anion then the name of the ion must be

followed by the word ion, eg Cl-would be written or said as "chloride ion".