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Some oxidation number rules
1) The oxidation number of a free element is always 0. The atoms in He and N2, for example, have oxidation numbers of 0.
2) The usual oxidation number of hydrogen is +1.
3 The oxidation number of oxygen in compounds is usually -2. Exceptions include OF2 because F is more electronegative than O, and BaO2, due to the structure of the peroxide ion, which is [O-O]2-.
a) HF, H = +1 F = -1
b)
c) H₂0, H = +1 O = -2
d) Pl3, P = +3 I = -1
e) CS₂, C = +4 S = -2
f) Na₂O₂, Na = +1 O = -1
g) H₂CO3 H = +1 C =+4 O =-2
h) NO2 N = +2 O = -2
i) SO2-4 S =+6 O = -2