Polyatomic Ion Calculator. Positive Ion: H Li Na K Rb Cs Al Mg Ca Sr Be NH4+1 Cu+1 Ag Cu+2 Fe+2 Pb+2 Hg2+2 Sn+2 Fe+3 Ba+2 Negative Ion: F Cl Br OH NO3 C2H3O2 ClO3 NO2 CO3-2 CrO4-2 SO4-2 Sulfite N-3 PO4-3 P-3 Result: