Symbol	He	Atomic radius: pm	-	Fusion: kJ/Mole	-
Name	Helium	Ionic radius: pm	-	Boiling point: °C	-269
Atomic number	2	Electron affinity	Unst Anion	Melting point: °C	-
Atomic weight	4.003	1st  ion potential	24.59	Specific Heat Cap: J/(g K)	5.19
Classification	Noble gas	Natural form	Gas(He2)	Thermal Cond: W/(cm K)	0.002
Configuration	1s2	Crystal structure	Hex	Electrical Cond	-
Oxidation states	-	Density	0.179	Abundance: mg/kg-crust	0.008
Electronegativity	-	Vaporization: kJ/Mole	0.08
Helium was discovered in 1895 by Sir William Ramsey.			Uses - balloons, blimps, cryogenics, deep sea diving, aluminum welding shield gas (Heliarc)