Helium
- Symbol
- He
- Atomic number
- 2
- Standard atomic weight
- 4.002602(2)
- Group
- 18
- Period
- 1
- Classification
- Noble gas
Supported application areas
- Isotope research
- Analytical and reference work
- Application-specific scientific programs
Element 2
Helium (He)
Helium is element 2 in the periodic table. This page organizes its naturally occurring isotope information and related Golden Eagle catalog entries.
Isotope records
Listed isotopes
Natural abundance values are shown only where included in the verified reference layer. Commercial specifications remain inquiry-led.
- Protons
- 2
- Neutrons
- 1
- Natural abundance
- 0.0002% (representative composition)
- Enrichment
- Contact for specification
- Protons
- 2
- Neutrons
- 2
- Natural abundance
- Reference value not displayed
- Enrichment
- Contact for specification