What is the oxidation state of an individual nitrogen atom in NH2OH?
Oxidation number is the charge left on the central atom when all the bonding electrons are removed with the charge going to the most electronegative atom.
Electronegativity is a formalism or a concept, it is a contrived parameter; formally it is the tendency of an atom in an element to polarize electron density towards itself. Electronegativity increases across a Period (because nuclear charge,
So if we split up hydroxylamine:
Then split up the nitrogen containing fragment:
So the oxidation state of nitrogen in hydroxylamine is
If I do the same for ammonia, or methane, I get
See this link for related discussion: http://socratic.org/questions/oxygen-has-1-oxidation-state-in-peroxide-but-each-oxygen-forms-two-bonds-why