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the chemical element of atomic number 7, a colourless, odourless unreactive gas that forms about 78 per cent of the earth's atmosphere. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant.
Nitrogen (N), nonmetallic element of Group 15 [Va] of the periodic table. It is a colourless, odourless, tasteless gas that is the most plentiful element in Earth's atmosphere and is a constituent of all living matter
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Nitrogen is the chemical element with the symbol n and the atomic number =7. It is also a naturally occuring element that is essential for growth and reproduction in both plants and animals .It is the components of amino acids and urea . The nitrogen in amino acids and urea is organic nitrogen .We use the term "organic nitrogen" to described a nitrogen compound that had its origin in living materials . Nitrogen comprises about 78% in Earth's atmosphere.