logoAround science

He - Helium - periodic table of the elements

A light inert gas and the second most abundant element in the universe. Helium was discovered in 1868 by J. Norman Lockyear in the spectrum of a solar eclipse. If you breathe this in, you can make a funny voice.


Atomic number - 2 Density g/mL 0 .0001787
Atomic weight u 4 .0026 Melting point K 0 .95
Bonding radius A 0 .93 Boiling point K 4 .215
Atomic radius A 0 .49 Heat of vaporization kJ/mol 0 .0845
Ionization Potential V 24 .587 Heat of fusion kJ/mol -
Electronegativity - - Specific heat J/gK 5 .193
The oxide is unknown.
Crystal are hexagonal.

Electron configuration: 1s2

Other elements of the periodic table

123456789101112131415161718
HHe
LiBeBCNOFNe
NaMgAlSiPSClAr
KCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr
RbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXe
CsBaLa * HfTaWReOsIrPtAuHgTlPbBiPoAtRn
FrRaAc ** RfDbSgBhHsMt110111112113
Lanthanides* CePrNdPmSmEuGdTbDyHoErTmYbLu
Actinides ** ThPaUNpPuAmCmBkCfEsFmMdNoLr