A brown gas, formula NO 2 , found at all levels in the atmosphere. In the troposphere it photodissociates to give free oxygen atoms, which then form ozone, and is thus a key player in local and ...
(Symbol N. ) A colorless, tasteless, odorless gaseous element, atomic number 7, atomic weight 14. 007. It is the most abundant constituent of the atmosphere, amounting to 78. 09% by volume of dry ...