He
Helium
Z 2 4.003 g/molNoble Gas
Group
18
Period
1
Block
s
Occurrence
Primordial
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
Universe23%230,000 ppm
x
Sun23%230,000 ppm
x
Meteorites---
x
Earth's crust< 0.0001%0.008 ppm
x
Oceans< 0.0001%< 0.0001 ppm
x
Humans---
x