For 10 points, name this element with atomic number 7 whose diatomic form comprises 78% of Earth's atmosphere.
Heating substances with sulfuric acid is used to determine the amount of this element in the Kjeldahl method. Two atoms of this element are triple bonded in a diazonium salt, and three atoms of this element connected by double bonds form an azide ion. It is reacted with hydrogen in the Haber-Bosch process, the main artificial method of fixing it. An atom of this element has a lone electron pair in amine groups. For 10 points, name this element with atomic number 7 whose diatomic form comprises 78% of Earth's atmosphere.
Heating substances with sulfuric acid is used to determine the amount of this element in the Kjeldahl method.
nitrogen [prompt on N]