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Polyatomic Ions Set 4 of 4

Nine of the thirty-six polyatomic ions
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arsenate
[AsO₄]³⁻
selenate
[SeO₄]²⁻
silicate
[SiO₃]²⁻
acetate
[C₂H₃O₂]⁻
thiocynate
[SCN]⁻
borate
[BO₃]³⁻
fluorate
[FO₃]⁻
fluorite
[FO₂]⁻
ammonium
[NH₄]⁺