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Krypton (Kr)
Atomic number 36 · noble
| Atomic number | 36 |
|---|---|
| Atomic mass | 83.798 u |
| Molar mass | 83.798 g/mol |
| Category | noble |
| Group / period / block | 18 / 4 / p |
| Electron configuration | [Ar] 3d10 4s2 4p6 |
| Electrons per shell | 2, 8, 18, 8 |
| Density | 0.00342 g/cm³ |
| First ionisation energy | 13.9996 eV |
| Melting point | 115.78 K (-157.37 °C) |
| Boiling point | 119.73 K (-153.42 °C) |
| Common oxidation states | +2 |
| Abundance in Earth's crust | 0.0001 ppm |
Uses
Flash lamps, lasers
Discovery
1898, Sir William Ramsey, M.W. Travers