17Cl35.45
Chlorine
HalogensBlock pPeriod 3Group 17gas at 20 °C
- Configuration :
- [Ne] 3s² 3p⁵
- Atomic mass :
- 35.45 u
- French :
- Chlore
3D Bohr-model representation of the Chlorine atom (symbol Cl, atomic number Z=17). Electron shell configuration: 2, 8, 7 electrons.
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Bohr model · educational
Bohr model of chlorine
Chlorine (Cl) has 17 electrons, spread over 3 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) | 7 |
The Bohr model is a teaching picture: electrons do not travel in circular orbits, but the number of electrons per shell is exact.
Related lesson
Mixtures and solutions
Homogeneous and heterogeneous mixtures, solubility, saturation. How to separate a mixture (filtration, decanting, evaporation).
9 minElectron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁵
Short[Ne] 3s² 3p⁵
Valence electrons7
KLMNOPQ shells
K2
L8
M7
Electronegativity
Pauling3.16
Allen2.869
Mulliken (eV)—
Atomic radii
Empirical100 pm
Calculated79 pm
Covalent102 pm
Van der Waals175 pm
Ionic radii (Shannon-Prewitt)
-1181 pm
Successive ionisation energies
I₁1251.2 kJ/mol
I₂2298 kJ/mol
I₃3822 kJ/mol
I₄5158.6 kJ/mol
I₅6542 kJ/mol
Electron affinity349 kJ/mol
Oxidation states
-1+1+2+3+4+5+6+7
Bold states = most common.
Warm-up
Chlorine — 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