Nítrójìn tàbí Náítrójìn ni ẹ́límẹ̀ntì kẹ́míkà kan tó ní àmì-ìdámọ̀ N àti nọ́mbà átọ̀mù 7. Nítrójìn bíi ẹ́límẹ̀ntì jẹ́ ẹ̀fúùfù átọ̀mùméjì aláilawọ̀, aláìlóòórùn, aláìní-ìtọ́wò àti aláìkópa ní ìgbà onídéédéé, tó jẹ́ 78.09% gẹ́gẹ́bí ìkúnnú ojúọ̀run Ayé. Nítrójìn jẹ́ wíwárí gẹ́gẹ́bí ohun inú afẹ́fẹ́ yíyàtọ̀, látọwọ́ oníṣègùn ará Skọ́tlàndì Daniel Rutherford, ní 1772. Nítrójìn wà nínú ẹbí àwọn pníktójìn. Nítrójìn jẹ́ ẹ́límẹ̀ntì tó wọ́pọ̀ nínú àgbálá-ayé, estimated at about seventh in total abundance in our 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 (propellants and explosives), and cyanides, contain nitrogen.