Electronic data
Shells: 1
Orbitals: 1s1
Electronegativity: 2.1, 2.2
1. Ionization potential: 13.5984 eV
2. Ionization potential: -- eV
3. Ionization potential: -- eV
Oxidation states: 1, -1
Electrical conductivity: --
Thermal data
Melting point: -255.34 °C
Boiling point: -252.87 °C
Specific heat: 14.304 J/gK
Heat of fusion: 0.05868 kJ/mol
Heat of vaporization: 0.44936 kJ/mol
Thermal conductivity: 0.001815 W/cmK
Steric data
Atomic radius: 0.79 Å
Ionic radius: 1.54 Å (+1)
Covalent radius: 0.32 Å
Atomic volume: 14.4 cm³/mol
Density (293 K): 0.00008988 g/cm³
Crystal structure: hexagonal
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