Nitrogen is a chemical substance and its symbol is N. The atomic number and atomic mass of nitrogen is 7 and 14 respectively. The number of electrons per shell in a nitrogen atom is 2 and 5. The electronic configuration of nitrogen is 1s2 2s2 2p3. A nitrogen atom needs three electrons to complete outer most shell. So, nitrogen atom forms three single covalent bonds with other atoms. Moreover, two nitrogen atoms are combined by a triple covalent bond to form a nitrogen molecule.