| General |
|---|
| Name | Krypton | | Symbol | Kr | | Number | 36 | | Chemical series | Noble gases | | Group / Period | 18 / 4 | | Block | p-block | | CAS registry number | 7439-90-9 |
| Physical properties |
|---|
| State | gas | | Density | 3.749 g/L | | Melting point | 115.79 K (-157.36°C, -251.25°F) | | Boiling point | 119.93 K (-153.22°C, -243.80°F) | | Critical point | 209.41 K, 5.50 MPa |
| Atomic properties |
|---|
| Atomic Weight | 83.798 g/mol | | Crystal structure | cubic face centered | | Electronegativity | 3.00 | | Atomic radius | | | Atomic radius (calculated) | 88 pm | | Electron configuration | [Ar] 3d10 4s2 4p6 | | Electrons per shell | 2, 8, 18, 8 | | Number of protons | 36 | | Number of neutrons | 48 |
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Rubidium