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Learn Your Polyatomics

Across
OH -
BO3 -3
Cr2O7 -2
ClO4 -
MnO4 -
ClO3 -
CO3 -2
ClO2 -
BrO3 -
NO2 -
Down
PO4 -3
SO4 -2
NO3 -
IO3 -
HSO4 -
HCO3 -
C2H3O2 -
AsO4 -3
CrO4 -2