Helium

Properties

Atomic Number

2

Atomic Symbol

He

Atomic Mass

4.002602

CAS No.

7440-59-7

Density

0.1785 g/l

Series

noble gas

Boiling Point

1,627°C

Thermal Conductivity

0.001513 W/cm °C

Heat of Fusion

0.02 kJ/mol

Heat of Vaporization

0.083 kJ/mol

Electronegativity

2.2 pauling

Crystal Structure

Cubic