polyatomic ions and oxidation numbers

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Cu (copper)

+1 +2

Mn (manganese)

+4 +7 +3 +2

dichromate

Cr2O7 -2

chlorite

ClO2 -

Ni (nickel)

+3 +2

hydronium

H3O +

Pb (lead)

+2 +4

thiocyanate

SCN -

Hg (mercury)

+1 +2

Fe (iron)

+3 +2

Cr (chromium)

+6 +3 +2

Co (cobalt)

+3 +2

Zn (zinc)

+2

chlorate

ClO3 -

perchlorate

ClO4-

cyanide

CN-

Ag (silver)

+1

Au (gold)

+1 +3

hydrogen carbonate

HCO3 -

Cd (cadmium)

+2

phosphite

PO3 -2

chromate

CrO4 -2

thiosulfate

S2O3 -2

sulfite

SO3 -2

mangonate

MnO4 -2

sulfate

SO4 -2

oxolate

C2O4 -2

hypochlorite

ClO-

dimercury

Hg2 +2

ammonium

NH4 +

peroxide

O2 -2

carbonate

CO3 -2

acetate

C2H3O2 -

nitrite

NO2 -

hydroxide

OH -

nitrate

NO3 -

permanganate

MnO4 -

Hydrogen sulfate

HSO4 -

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