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N(II)
O(-II)
P4O10
P(III)
O(-II)
N2O3
N(III)
O(-II)
HNO2
H(I)
N(III)
O(-II)
K2MnO4
K(I)
Mn(VI)
O(-II)
MgCO3
Mg(II)
C(IV)
O(-II)
PO4 3-
P(V)
O(-II)
MnO4 -
Mn(VII)
O(-II)