polyatomic anions

pleas4e wqhy is he making us memorize all of this before next class it's been two days please end me now

Cl^-

chloride ion

I^-

iodide ion

PO₄^3-

phosphate ion

ClO₃^-

chlorate ion

ClO₂^-

chlorite ion

ClO₄^-

perchlorate ion

HPO₄^2-

hydrogen phosphate ion

CN^-

cyanide ion

F^-

fluoride ion

ClO^-

hypochlorite ion

CrO₄^2-

chromate ion

HCO₃^-

bicarbonate ion

Cr₂O₇^2-

dichromate ion

HSO₄^-

hydrogen sulfate ion

OH^-

hydroxide ion

S^2-

sulfide ion

NO₃^-

nitrate ion

S₂O₃^2-

thiosulfate ion

O₂^2-

peroxide ion

C₂H₃O₂^-

acetate ion

CO₃^2-

carbonate ion

Br^-

bromide ion

SO₄^2-

sulfate ion

NO₂^-

nitrite ion

O^2-

oxide ion

HPO₃^2-

hydrogen phosphite

BO₃^3-

borate ion

MnO₄^-

permanganate ion

CH₃COO^-

acetate ion

H₂PO₄^-

dihydrogen phosphate ion

HCO₃^-

hydrogen carbonate ion