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|part of speech:
||a chemical element that has seven protons in each nucleus and that occurs as a colorless, odorless gas that comprises about eighty percent of the earth's atmosphere, or in important compounds such as nitrates, proteins, nucleic acids, and ammonia. (symbol: N)
||nitrogen chilled below -196 degrees Celsius so that it is a liquid, used as a refrigerant and quick-freezing agent.
||any mixture containing organic compounds of nitrogen, used as a fertilizer.