Nitrogen ( N )

• Atomic number: 7
• Appearance: colorless gas
• Standard atomic weight: 14.007
• Group: group 15 (pnictogens)
• Period: 2
• Electron configuration: 1s² 2s² 2p³
• Element category: reactive nonmetal
• Melting point: 63.15 K
• Boiling point: 77.355 K
• Sublimation point:
Standard Temperature ( 273.15 ) and Pressure ( 1 bar = 10⁵ Pa )
• Phase at STP: ( N₂ ) gas
• Density at STP:
• Heat of fusion: ( N₂ ) 0.72 kJ/mol
• Heat of vaporization: ( N₂ ) 5.56 kJ/mol
• Molar heat capacity: ( N₂ ) 29.124 kJ/(mol·K)
• Oxidation states: −3, −2, −1, +1, +2, +3, +4, +5
• Electronegativity: Pauling scale: 3.04
• Covalent radius: 71 pm (1×10⁻¹² m)
• Van der Waals radius: 155 pm (1×10⁻¹² m)
• Crystal structure: hexagonal
• Speed of sound: 353 m/s (gas, 27 °C)
• Thermal expansion:
• Thermal conductivity: 0.02583 W/(m·K)