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9F18.9984
Fluorine
HalogensBlock pPeriod 2Group 17gas at 20 °C
Configuration :[He] 2s² 2p⁵
Atomic mass :18.998403163 u
French :Fluor
3D Bohr-model representation of the Fluorine atom (symbol F, atomic number Z=9). Electron shell configuration: 2, 7 electrons.
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Bohr model · educational
Electron configuration
Full1s² 2s² 2p⁵
Short[He] 2s² 2p⁵
Valence electrons7
KLMNOPQ shells
K2
L7
Electronegativity
Pauling3.98
Allen4.193
Mulliken (eV)—
Atomic radii
Empirical50 pm
Calculated42 pm
Covalent57 pm
Van der Waals147 pm
Ionic radii (Shannon-Prewitt)
-1133 pm
Successive ionisation energies
I₁1681 kJ/mol
I₂3374.2 kJ/mol
I₃6050.4 kJ/mol
I₄8407.7 kJ/mol
I₅11022.7 kJ/mol
Electron affinity328 kJ/mol
Oxidation states
-1
Bold states = most common.