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POLYATOMICS CROSSWORD PUZZLE

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