Periodic table of elements

2 - Helium [He]

2: Helium - Helium [He]
Group: 18
Period: 1
Atomic number: 2
Atomic mass: 4.002602
Configuration: 1s2
Atomic radius: 31 pm
Covalent radius: 28 pm
Electron affinity: 0 eV
Ionization energy: 24.5874 eV
Electronic term: 1S0
Mass fraction in the earth crust: 0.0000000055
Mass fraction in the earth space: 0.23
Electronegativity: 4.5

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