In its natural form by itself (not combined with other elements) it forms a diatomic molecule, which is a gas in the atmosphere. In fact it is the most abundant gas in our atmosphere.
In the atmosphere it is a gas, in the soil it its a solid, nitrogen gas can be converted to liquid in air separation plants. Also, as a liquid Nitrogen is very cold -- cryogenic temperatures. Nitrogen is stored as liquid commonly for convenience, even when gas is required, because liquid is more dense than gas and more nitrogen could be stored in the same volume. Simply, the answer to your question is nitrogen is a solid, liquid and gas depending on where you find it or how you've modified it.
inert gas inert gas inert gas
At normal atmospheric pressure, nitrogen is gaseous over the entire liquid range of water (and considerably below as well; the boiling point of nitrogen is about 77 K).
colorless gas
nitrogen
Nitrogen monoxide gas and oxygen gas
The nitrogen gas present in the atmosphere is called atmospheric nitrogen. About 78% of the Earth's atmosphere is made of nitrogen gas.
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nitrogen fixation
Nitrogen is called nitrogen because when scientist first discover it the scientist thought up the name nitrogen because that name has connection to the gas.
Nitrogen Fixation.
denitrification
Nitrogen Fixation.
Dentrification
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this gas is called nitrogen.
You think probable to denitrification.