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Oxygen
Block pPeriod 2Group 16gas at 20 °C
Configuration :[He] 2s² 2p⁴
Atomic mass :15.999 u
French :Oxygène
3D Bohr-model representation of the Oxygen atom (symbol O, atomic number Z=8). Electron shell configuration: 2, 6 electrons.
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Bohr model · educational
Electron configuration
Full1s² 2s² 2p⁴
Short[He] 2s² 2p⁴
Valence electrons6
KLMNOPQ shells
K2
L6
Electronegativity
Pauling3.44
Allen3.61
Mulliken (eV)—
Atomic radii
Empirical60 pm
Calculated48 pm
Covalent66 pm
Van der Waals152 pm
Ionic radii (Shannon-Prewitt)
-2140 pm
Successive ionisation energies
I₁1313.9 kJ/mol
I₂3388.3 kJ/mol
I₃5300.5 kJ/mol
I₄7469.2 kJ/mol
I₅10989.5 kJ/mol
Electron affinity141 kJ/mol
Oxidation states
-2-10+1+2
Bold states = most common.