He
Helium
2
Atomic Number: 2
Atomic mass: 4.002602
Ionization energy: 2372
Electronaffinity: 0
Covalent radius: 32
Calculated radius: 31
Empirical radius:
Vanderwaals radius: 140
Electronegativity:
Density: 0.1786
Oxidation states:
Melting point:
Boiling point: 4
Electron configuration: 1s2
Element group: 18
Element period: 1

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