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In addition, groups may be idenitifed by the first element in each group-so the Group 16 elements is sometimes called the oxygen group. There is considerable confusion surrounding the Group labels.
To find this answer: Oxygen has an oxidation number of -2. Hydrogen has an oxidation number of +1, and there are 3 of them. you want to get the oxidation numbers to add up to 0, so it would be neutral. -2 + 3(+1) = +1. Now, to get this to equal zero, it means that N has to be -1.