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Neon (Ne)
Atomic number 10 · noble
| Atomic number | 10 |
|---|---|
| Atomic mass | 20.1797 u |
| Molar mass | 20.1797 g/mol |
| Category | noble |
| Group / period / block | 18 / 2 / p |
| Electron configuration | [He] 2s2 2p6 |
| Electrons per shell | 2, 8 |
| Atomic radius | 160.0 pm |
| Density | 0.00082 g/cm³ |
| First ionisation energy | 21.5645 eV |
| Melting point | 24.56 K (-248.59 °C) |
| Boiling point | 27.1 K (-246.05 °C) |
| Abundance in Earth's crust | 0.005 ppm |
Uses
Neon signs, lasers
Discovery
1898, Sir William Ramsey, M.W. Travers