Periodic Table of Elements showing Helium noble gas elements


Atomic Number2
Molar Mass4 gmol-1
Electron Configuration1s2
Normal Stategas/nonmetal
Density @STP0.18x10-3 g cm-3
Melting Point-272oC
Boiling Point-296oC
Stable Isotopes3He, 4He
Atomic Radius128 pm
Ionic Radiusn/a pm
Electronegativity (Pauling)n/a
Ionization Energy (1st)2372 kJ mol-1
Ionization Energy (2nd)5250 kJ mol-1
Ionization Energy (3rd)n/a kJ mol-1
Molar Heat Capacity20.8 J K-1mol-1
Standard Molar Entropy126.2 J K-1mol-1
Enthalpy of Fusion0.021 kJ mol-1
Enthalpy of Vapourization0.082 kJ mol-1
[Back to Periodic table]

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