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6 terms

Part 4: I'll Learn Polyatomic Ions 5 A Time Please

This one even has six for an additional 20% of the fun!
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Phosphite
PO3^3-
Phosphate
PO4^3-
Hydrogen Phosphate
HPO4^2-
Dihydrogen Phosphate
H2PO4^-
Hydroxide
OH^-
Peroxide
O2^2-