What are the oxidation numbers of each element in these examples: a) H2SO4 b) N2 c) NH4+
a) H2SO4 ANSWER: H: +1 S: +6 O: -2 b) N2 ANSWER: N: 0 (all elements not within a compound have an oxidation number of 0 eg I2, O2, K) c) NH4+ ANSWER: N: -3 H: +1 (sum of oxidation numbers within compound should equal the overall charge of the compound)
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