Nitrogen was isolated by the British physician
Daniel Rutherford in 1772 and recognized as an
elemental gas by the French chemist Antoine
Laurent Lavoisier about 1776. Properties
Nitrogen is a colorless, odorless, tasteless,
nontoxic gas. It can be condensed into a colorless
liquid, which can in turn be compressed into a
colorless, crystalline solid. Nitrogen exists in two
natural forms of isotopes, and four radioactive
isotopes have been artificially prepared. Nitrogen
melts at -210.01° C (-346.02° F), boils at
-195.79° C (-320.42° F), and has a density of
1.251 g/liter at 0° C (32° F). The atomic weight of
nitrogen is 14.007. Nitrogen is obtained from the
atmosphere by passing air over heated copper or
iron. The oxygen is removed from the air, leaving
nitrogen mixed with some inert gases. Pure
nitrogen is obtained by partial evaporation of liquid
air because liquid nitrogen has a lower boiling
point than liquid oxygen, the nitrogen evaporates
off first......

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Title: Nitrogen
Approximate Word Count: 459
Approximate Pages: 2 (250 words per double-spaced page)

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