Selenium
- Symbol
- Se
- Atomic number
- 34
- Standard atomic weight
- 78.971(8)
- Group
- 16
- Period
- 4
- Classification
- Nonmetal
Supported application areas
- Isotope research
- Analytical and reference work
- Application-specific scientific programs
Element 34
Selenium (Se)
Selenium is element 34 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
- 34
- Neutrons
- 40
- Natural abundance
- Reference value not displayed
- Enrichment
- Contact for specification
- Protons
- 34
- Neutrons
- 42
- Natural abundance
- Reference value not displayed
- Enrichment
- Contact for specification
- Protons
- 34
- Neutrons
- 43
- Natural abundance
- Reference value not displayed
- Enrichment
- Contact for specification
- Protons
- 34
- Neutrons
- 44
- Natural abundance
- Reference value not displayed
- Enrichment
- Contact for specification
- Protons
- 34
- Neutrons
- 46
- Natural abundance
- Reference value not displayed
- Enrichment
- Contact for specification
- Protons
- 34
- Neutrons
- 48
- Natural abundance
- Reference value not displayed
- Enrichment
- Contact for specification