Chemical Element: Helium
Properties:
Periodic Number: 2
Symbol: He
Name: Helium
Average Mass: 4.002602 g/mol
Stable: yes
Density: 0.1
Boiling Point: -268.9°C
Melting Point: -272.2°C
Specific Heat: 5.2 J/(g*K)
Ionisation Potential: 24.6 eV
2
He
4.002602
Isotopes:
Name Neutrons Mass Abundance Spin Stable Half Life
8He 6 8.033922 0 - no -
3He 1 3.0160293097 0.00000137 +1/2 yes -
5He 3 5.01222 0 - no -
9He 7 9.04382 0 - no -
4He 2 4.0026032497 0.99999863 - yes -
7He 5 7.02803 0 - no -
10He 8 10.0524 0 - no -
6He 4 6.0188881 0 - no -