Nitrogen

carbon ← nitrogen → oxygen — ↑ N ↓ P

Atomic properties Atomic number 7 Standard atomic weight 14.0067(2) Electron configuration [He] 2s2 2p3 Physical properties Melting point 63.3 K (−209.8 °C) Boiling point 77.34 K (−195.81 °C) Triple point 63.14 K, 0.1253(2) bar Critical point 126.19(1) K, 33.978(7) bar Density 1.185 kg m−3 (1 atm, 15 °C) 4.614 kg m−3 (1 atm, 77.3 K) 0.808 607 g cm−3 (l, 77.3 K) Chemical properties Electronegativity 3.04 (Pauling) Solubility in water 23.4 cm3 kg−1 (1 atm, 0 °C) Ionization energies 1st 14.534 096(12) eV 1395.4176(12) kJ mol−1 2nd 29.601 eV 2856.1 kJ mol−1 3rd 47.448 eV 4578.0 kJ mol−1 4th 77.472 eV 7474.9 kJ mol−1 5th 97.888 eV 9444.8 kJ mol−1 6th 352.057 eV 33 968.3 kJ mol−1 7th 667.029 eV 64 358.5 kJ mol−1 Total 1286.029 eV 124 082.9 kJ mol−1 Atomic radii Covalent radius 71 pm Ionic radius 146 pm (N3−, Td) Van der Waals radius 155 pm Thermodynamic properties Standard entropy 191.609(4) J K−1 mol−1 Enthalpy change of atomization 472.68(40) kJ mol−1 Miscellaneous CAS number 7727-37-9 EC number 231-783-9 Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).

Nitrogen (symbol: N) is a chemical element. It is a colourless gas at room temperature and forms four-fifths of the Earth's atmosphere.

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