He
Helium
Z 2 4.003 g/molNoble Gas
Group
18
Period
1
Block
s
Occurrence
Big Bang fusion 90%Exploding massive stars 5%Dying low-mass stars 5%Geochemical class: Atmophile
Biological Role
---
History
1868 (discovery)
Pierre Jules César Janssen
1868 (discovery)
Norman Lockyer
1895 (isolation)
William Ramsay
1895 (isolation)
Per Theodor Cleve, Abraham Langlet
Named By
Norman Lockyer
Latin Name
Helium
Abundance
Solar System24.4522%244,522 ppm
x
Sun24.061%240,610 ppm
x
Meteorites< 0.0001%0.00917 ppm
x
Earth's crust< 0.0001%0.008 ppm
x
Oceans< 0.0001%< 0.0001 ppm
x
Humans---
x