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Learn the formula and names of polyatomic ions.

ammonium ion

NH₄ ⁺

acetate ion

C₂H₃O₂ ⁻

hydroxide ion

OH -

hypochlorite ion

ClO ⁻

chlorite ion

ClO₂ ⁻

chlorate ion

ClO₃ ⁻

perchlorate ion

ClO₄ ⁻

nitrite ion

NO₂ ⁻

nitrate ion

NO₃ ⁻

permanganate ion

MnO₄ ⁻

cyanide ion

CN ⁻

silicate ion

SiO₃ ²⁻

thiosulfate ion

S₂O₃ ²⁻

hydride ion

H ⁻

carbonate ion

CO₃ ²⁻

hydrogencarbonate ion

HCO₃ ⁻

chromate ion

CrO₄ ²⁻

dichromate ion

Cr₂O₇ ²⁻

phosphate ion

PO₄ ³⁻

hydrogenphosphate ion

HPO₄ ²⁻

dihydrogenphosphate ion

H₂PO₄ ⁻

phosphite ion

PO₃ ³⁻

sulfate ion

SO₄ ²⁻

sulfite ion

SO₃ ²⁻

hydrogensulfate ion

HSO₄ ⁻

cyanate ion


thiocyanate ion


oxalate ion

C₂O₄ ²⁻

arsenate ion

AsO₄ ³⁻

peroxide ion

O₂ ²⁻

hypoiodite ion

IO ⁻

iodite ion

IO₂ ⁻

iodate ion

IO₃ ⁻

periodate ion

IO₄ ⁻

hypobromite ion

BrO ⁻

bromite ion

BrO₂ ⁻

bromate ion

BrO₃ ⁻

perbromate ion

BrO₄ ⁻

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