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Nitrogen (N)
Atomic number 7 · Non-metal
| Atomic number | 7 |
|---|---|
| Atomic mass | 14.007 u |
| Molar mass | 14.007 g/mol |
| Category | Non-metal |
| Group / period / block | 15 / 2 / p |
| Electron configuration | [He] 2s2 2p3 |
| Electrons per shell | 2, 5 |
| Electronegativity (Pauling) | 3.04 |
| Atomic radius | 65.0 pm |
| Density | 0.00114 g/cm³ |
| First ionisation energy | 14.5341 eV |
| Melting point | 63.15 K (-210.00 °C) |
| Boiling point | 77.35 K (-195.80 °C) |
| Common oxidation states | -3, +3, +5 |
| Abundance in Earth's crust | 19 ppm |
Uses
Fertilisers, food packaging, liquid-nitrogen cooling
Discovery
1772, Daniel Rutherford