Nitryl ion (nitrouium ion)
The ion NO2+ found in mixtures of nitric acid and sulphuric acid and solutions of nitrogen oxides in nitric acid. Nitryl salts, such a NO2+ClO4-, can be isolated but are extremely reactive, Nitryl ions generated in situ are used for nitration in organic chemistry.
Nobelium
A chemical element, symbol NO, atomic number 102, atomic weight 254 when the element is produced in the laboratory; a synthetic element, in the actinium series.
Noble gas
A gas in group 0 of the periodic table of the elements; it is monoatomic and, with limited exceptions, chemically inert. Also known as inert gas.
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