All chemical elements

Symbol

He

Atomic number

2

Chemical property

Noble gas

Origin o the name

the Greek helios, 'sun'

Group

18

Period

1

Atomic weight (u)

4.002602

Atomic weight uncertainty (u)

0.000002

Density (g/cm³)

0.000179

Boiling point (K)

4.22

Heat capacity (J/(g·K))

5.193

Abundance in earth's crust (mg/kg)

0.008