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Nitrogen was discovered by a Scottish physician, Daniel Rutherford, in 1772. He often wondered what the air was made of so he conducted a simple experiment, with which he discovered nitrogen. Rutherford  began with an empty bottle that he turned upside down in a pan of water, so that the air was trapped and tested the trapped air.

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Symbol - N
Atomic number - 7
Atomic Mass- 14.0067 u ± 0.0001 u

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Number 7 on the periodic table, Nitrogen is the most abundant element in Earth's atmosphere. More elements at http://www.periodicvideos.com/

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Melting point- -210°C
Boiling point- -195.8°C
Density- 1.251 g/L
Abundance in Earth's crust- 0.002%

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Nitrogen is found in the Earth's crust, but mostly is the Earth's atmosphere. It makes up 78.04% of the atmosphere. It is found in the form of gas

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Universe- 0.1%
Sun- 0.1%
Meteorites- 0.14%
Earth's crust- 0.002%
Oceans- 0.00005%
Humans- 2.6%

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-Plant fertilizer
-Nitric acid
- Nylon
-Dyes
-Explosives
-Refrigerators

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Nitrogen is a nonmetal and it is in group 15 on the periodic table.

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http://www.rsc.org/periodic-table/element/7/nitrogen

https://www.britannica.com/science/nitrogen

https://www.lenntech.com/periodic/elements/n.htm