An atom of this element has a lone electron pair in amine groups.
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]