1
Q
Group 14
A
Pb lead +2 instead of +4
2
Q
Group 13
A
Tl Thallium +1 instead of +3
3
Q
Group 17
A
F fluorine -1
4
Q
Hydrogen
A
+1 normally -1 in metal hydride compound with metals from groups 1,2 and 13
5
Q
Oxygen in a peroxide
A
ON of -1
eg. H2O2 Na2O2 BaO2
6
Q
Oxygen in a superoxide
A
ON is -½
eg. KO2, RbO2, CsO2
7
Q
Oxygen with flourine
A
ON is +1 with O2F2
ON is +2 with OF2
Oxidation Number
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