NITROGEN: N₂

(above) nitrogen image # 1: NITROGEN GAS: picture showing N₂ molecule. This image is 500 x 500 pixels; the original image is 4096 x 4096 pixels.

NITROGEN: forms the bulk of the atmosphere, comprising nearly four fifths of AIR. Under normal conditions it is a gas. It exists as a molecule of two nitogen atoms joined by a triple bond.

INDUSTRIAL USES OF NITROGEN: nitrogen is hydrogenated to create ammonia and is used in fabrication because it is unreactive.

BIOLOGICAL USES OF NITROGEN: used by plants following fixation by bacteria.