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Nitrogen is the seventh element in the periodic table. Nitrogen naturally occurs as a colorless and odorless gas, generally considered to be inert. As a liquid, it is also colorless and odorless, and is similar in appearance to water.

Nitrogen makes up 78% of Earth's atmosphere by volume. The compounds made of nitrogen, combined with other elements, are so active as to be most important in foods, poisons, fertilizers, and explosives.

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Nitrogen occurs in many forms and compounds:

Liquid nitrogen was used for many visual effects on Star Trek; see Star Trek: The Magazine Volume 1, Issue 9.

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