The answer is: N ≡ N.
Nitrogen (N) is in group 15 of Periodic table of elements and his atomic number is seven, which means that nitrogen has 7 protons and 7 electrons.
Electron configuration of nitrogen atom: ₇N 1s²2s²2p³.
Nitrogen is inert (low reactivity) nonmetal and has five valence electrons.
Nitrogen molecule (N₂) has strong nonpolar triple covalent bond (:N:::N:), that is why it is very stable and have low reactivity.
