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)