Krypton (Kr)
Krypton is the chemical element with atomic number 36 and symbol Kr. It is a gaz noble in period 4, group 18, with a standard atomic weight of 83.798 u.
Faits essentiels
- Z
- 36
- Atomic weight
- 83.798 u
- Category
- gaz noble
- State at 298 K
- Gas
- Occurrence
- primordial
- Discovered
- 1898
- CAS
- 7439-90-9
Propriétés mesurées
| Property | Value | Source |
|---|---|---|
| Electronegativity | 3 | National Center for Biotechnology Information (NIH) |
| Melting point | 115.79 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 119.93 K | National Center for Biotechnology Information (NIH) |
| Density stp | 0.004 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 202 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 1,350.8 kJ/mol | National Center for Biotechnology Information (NIH) |
Configuration électronique
- Noble gas notation
- [Ar] 3d¹⁰ 4s² 4p⁶
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶
- Electrons per shell
- 2, 8, 18, 8