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53I126.904
Iodine
HalogensBlock pPeriod 5Group 17solid at 20 °C
- Configuration :
- [Kr] 4d¹⁰ 5s² 5p⁵
- Atomic mass :
- 126.90447 u
- French :
- Iode
3D Bohr-model representation of the Iodine atom (symbol I, atomic number Z=53). Electron shell configuration: 2, 8, 18, 18, 7 electrons.
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Bohr model · educational
Related lesson
Chemical equilibria
Reversible reaction, reaction quotient Q, equilibrium constant K. Evolution criterion.
11 minElectron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁵
Short[Kr] 4d¹⁰ 5s² 5p⁵
Valence electrons7
KLMNOPQ shells
K2
L8
M18
N18
O7
Electronegativity
Pauling2.66
Allen2.359
Mulliken (eV)—
Atomic radii
Empirical140 pm
Calculated115 pm
Covalent139 pm
Van der Waals198 pm
Ionic radii (Shannon-Prewitt)
-1220 pm
Successive ionisation energies
I₁1008.4 kJ/mol
I₂1845.9 kJ/mol
I₃3180 kJ/mol
Electron affinity295.2 kJ/mol
Oxidation states
-1+1+3+4+5+6+7
Bold states = most common.