Calcium
- Symbol
- Ca
- Atomic number
- 20
- Standard atomic weight
- 40.078(4)
- Group
- 2
- Period
- 4
- Classification
- Alkaline-earth metal
Supported application areas
- Isotope research
- Analytical and reference work
- Application-specific scientific programs
Element 20
Calcium (Ca)
Calcium is element 20 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
- 20
- Neutrons
- 20
- Natural abundance
- Reference value not displayed
- Enrichment
- Contact for specification
- Protons
- 20
- Neutrons
- 22
- Natural abundance
- Reference value not displayed
- Enrichment
- Contact for specification
- Protons
- 20
- Neutrons
- 23
- Natural abundance
- Reference value not displayed
- Enrichment
- Contact for specification
- Protons
- 20
- Neutrons
- 24
- Natural abundance
- Reference value not displayed
- Enrichment
- Contact for specification
- Protons
- 20
- Neutrons
- 26
- Natural abundance
- Reference value not displayed
- Enrichment
- Contact for specification
- Protons
- 20
- Neutrons
- 28
- Natural abundance
- Reference value not displayed
- Enrichment
- Contact for specification