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36
Kr
83.798
Krypton
Noble gases · Group 18 · Period 4
Atomic properties
| Atomic number | 36 |
|---|---|
| Symbol | Kr |
| Standard atomic weight | 83.798 |
| Classification | Noble gases |
| Group | 18 |
| Period | 4 |
| Block | p-block |
| Electron configuration | [Ar] 3d10 4s2 4p6 |
| Electronegativity (Pauling) | 3.00 |
| Common oxidation states | 0, +2 |
Physical properties
| Phase at 20 °C | Gas |
|---|---|
| Density | 0.003749 g/cm³ |
| Melting point | -157.37 °C |
| Boiling point | -153.42 °C |
| Discovered | 1898 |
| CAS number | — |