'''Nítrójìn''' tàbí '''Náítrójìn''' is ani [[chemicalẹ́límẹ̀ntì elementkẹ́míkà]] withkan symboltó ní àmì-ìdámọ̀ '''N''' andàti [[atomicnọ́mbà numberátọ̀mù]] 7. ElementalNítrójìn nitrogenbíi isẹ́límẹ̀ntì ajẹ́ colorless,ẹ̀fúùfù [[diatomic|átọ̀mùméjì]] odorlessaláilawọ̀, tastelessaláìlóòórùn, andaláìní-ìtọ́wò mostlyàti [[inert|aláìkópa]] [[diatomic]] gas atní [[standard conditions|ìgbà onídéédéé]], constitutingtó jẹ́ 78.09% bygẹ́gẹ́bí volume ofìkùnnú [[Earth's atmosphere|ojúòrun Ayé]].<ref name="Gray" >{{cite book|last=Gray|first=Theodore|title=The Elements: A Visual Exploration of Every Known Atom in the Universe|year=2009|publisher=Black Dog & Leventhal Publishers|location=New York|isbn=978-1-57912-814-2}}</ref> TheNítrójìn elementjẹ́ nitrogenwíwárí wasgẹ́gẹ́bí discoveredohun asinú a separable component ofafẹ́fẹ́ airyíyàtọ̀, bylátọwọ́ Scottishoníṣègùn physicianará Skọ́tlàndì [[Daniel Rutherford]], inní 1772. ItNítrójìn belongswà tonínú theẹbí àwọn [[pnictogen|pníktójìn]] family.
NitrogenNítrójìn isjẹ́ aẹ́límẹ̀ntì commontó elementwọ́pọ̀ innínú the universeàgbálá-ayé, estimated at about seventh in total abundance in our [[Milky Way|galaxy]] and the [[Solar System]]. It is synthesised by fusion of carbon and hydrogen in supernovas. Due to the volatility of elemental nitrogen and its common compounds with hydrogen and oxygen, nitrogen is far less common on the rocky planets of the inner Solar System, and it is a relatively rare element on Earth as a whole. However, as on Earth, nitrogen and its compounds occur commonly as gases in the atmospheres of planets and moons that have atmospheres.
Many industrially important compounds, such as [[ammonia]], [[nitric acid]], organic nitrates ([[propellant]]s and [[explosive]]s), and [[cyanide]]s, contain nitrogen. The extremely strong bond in elemental nitrogen dominates nitrogen chemistry, causing difficulty for both organisms and industry in converting (or "fixing") the {{chem|N|2}} into useful [[Chemical compound|compounds]], but at the same time causing release of large amounts of often useful energy when the compounds burn, explode, or decay back into nitrogen gas. Synthetically-produced [[ammonia]] and [[nitrate]]s are key industrial [[fertilizer]]s,<ref name="Gray"/> and fertilizer nitrates are key pollutants in causing the [[eutrophication]] of water systems.
