36Kr83.798
Krypton
Noble gasesBlock pPeriod 4Group 18gas at 20 °C
- Configuration :
- [Ar] 3d¹⁰ 4s² 4p⁶
- Atomic mass :
- 83.798 u
3D Bohr-model representation of the Krypton atom (symbol Kr, atomic number Z=36). Electron shell configuration: 2, 8, 18, 8 electrons.
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Bohr model · educational
Bohr model of krypton
Krypton (Kr) has 36 electrons, spread over 4 shells. The diagram places them on circles around the nucleus, from the K shell — the closest — outward.
| Shell | Electrons |
|---|---|
| K (n = 1) | 2 |
| L (n = 2) | 8 |
| M (n = 3) | 18 |
| N (n = 4) | 8 |
The Bohr model is a teaching picture: electrons do not travel in circular orbits, but the number of electrons per shell is exact.
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶
Short[Ar] 3d¹⁰ 4s² 4p⁶
Valence electrons8
KLMNOPQ shells
K2
L8
M18
N8
Electronegativity
Pauling3
Allen2.966
Mulliken (eV)—
Atomic radii
Empirical88 pm
Calculated88 pm
Covalent116 pm
Van der Waals202 pm
Successive ionisation energies
I₁1350.8 kJ/mol
I₂2350.4 kJ/mol
I₃3565 kJ/mol
I₄5070 kJ/mol
I₅6240 kJ/mol
Electron affinity—
Oxidation states
0+2
Bold states = most common.
Warm-up
Krypton — do you remember?
3 questions on this page. The right answer shows every time, and nothing is asked of you to play.
No account · one minute