The key feature of an amine is a nitrogen atom bonded to a carbonyl carbon atom. Amides are another important nitrogen containing organic compound. But some elements especially gases exist in pairs of diatomic molecules. Since a compound has to consist of two or more elements nitrogen cannot be a compound, by definition. Nitrogen is essential to life on Earth. When these compounds contain nitrogen as well, this nitrogen is organic nitrogen. Nitrogen becomes a liquid at -210.00 degrees C. Liquid nitrogen looks like water. Nitrogen Compounds used as Explosives and Propellants. Organic compounds are chemical species containing C and H atom as essential components. Inorganic compounds are chemical species that has chemical elements other than carbon and hydrogen. Nitrogen compounds were known to alchemists as early as the Middle Ages, but nitrogen is formally considered to have been discovered by Daniel Rutherford in 1772, who called it noxious air or phlogisticated air (air from which the oxygen had been removed, usually by combustion). Nitrogen is also found in organic compounds such as amines, amides, and nitro groups. This is a mixture of potassium nitrate, carbon and sulfur. They can be gases and solids too. Dennis A. Hansell, Michael J. Follows, in Nitrogen in the Marine Environment (Second Edition), 2008. The nitrogen cycle converts nitrogen into compounds that plants and animals can use. It is a component of all proteins, and it can be found in all living systems. 5 The Atlantic as a Source of Nitrogen to the Atmosphere. Nitrogen is an element that can combine with itself or with other elements to make different compounds. Nitrogen is an essential nutrient for plants and a significant component of proteins, which all animals need to grow, reproduce and survive. Nitrogen with a symbol N is an element. Nitrogen is an element, not a compound. Elements exist just like any other substances. A compound is composed of two or more elements chemically bonded. Like esters, amides are formed in a condensation reaction. Common compounds with nitrogen atoms include ammonia (NH 3 ), nitrous oxide (N 2 O), nitrites, and nitrates. One of the earliest uses of a nitrogen compound as an explosive was potassium nitrate, also called saltpeter, used in gunpowder. Nitrogen gas consists of molecules, each of which consists of two atoms of the element nitrogen. For instance nitrogen gas, N 2, is a compound made when two nitrogen atoms form a chemical bond. It is found in nature as nitrogen gas, also called dinitrogen, with the chemical formula #"N"_2"#, and makes up #78%# of the atmosphere. 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