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Hydrogen
Block sPeriod 1Group 1gas at 20 °C
Configuration :1s¹
Atomic mass :1.008 u
French :Hydrogène
3D Bohr-model representation of the Hydrogen atom (symbol H, atomic number Z=1). Electron shell configuration: 1 electrons.
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Bohr model · educational
Electron configuration
Full1s¹
Short1s¹
Valence electrons1
KLMNOPQ shells
K1
Electronegativity
Pauling2.2
Allen2.3
Mulliken (eV)—
Atomic radii
Empirical25 pm
Calculated53 pm
Covalent31 pm
Van der Waals120 pm
Successive ionisation energies
I₁1312 kJ/mol
Electron affinity72.8 kJ/mol
Oxidation states
-1+1
Bold states = most common.