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Reference Terms
from Wikipedia, the free encyclopedia


Nitrogen is the chemical element in the periodic table that has the symbol N and atomic number 7.

Nitrogen constitutes 78 percent of Earth's atmosphere and is a constituent of all living tissues.

Nitrogen forms many important compounds such as amino acids, ammonia, nitric acid, and cyanides.

Note:   The above text is excerpted from the Wikipedia article "Nitrogen", which has been released under the GNU Free Documentation License.
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Earth & Climate News
February 27, 2017

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updated 12:56 pm ET