nitrogen - Dictionary definition and pronunciation - Yahoo! Education

Definition of nitrogen


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ni·tro·gen  audio  (ntr-jn) KEY 

NOUN:
Symbol N
A nonmetallic element that constitutes nearly four-fifths of the air by volume, occurring as a colorless, odorless, almost inert diatomic gas, N2, in various minerals and in all proteins and used in a wide variety of important manufactures, including ammonia, nitric acid, TNT, and fertilizers. Atomic number 7; atomic weight 14.0067; melting point -209.86°C; boiling point -195.8°C; valence 3, 5. See Table at element.

ETYMOLOGY:
French nitrogène : nitro-, nitric acid (from New Latin; see nitro-) + -gène, -gen


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