Basic Information
Name: Helium
Symbol: HE
Atomic weight: 4.00260
Classification: Helium is a noble gas and a nonmetal
color: colorless
Melting Point: -272.2oC, 0.95 K
Boiling Point:-268.9 oC, 4.2 K
Shells: 2
Electron configuration: 1s2
Density @ 20oC: 0.0001787 g/cm3
Atomic volume: 27.2 cm3/mol
Structure: usually hexagonal close-packed
(v.high pressure needed to solidify helium)