Recognised as Chemical element
Calcium
- Ca
- Z = 20
- alkaline earth
Calcium (Ca) is element 20, a alkaline earth in period 4 and group 2. Its standard atomic weight is 40.078 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolCa
Standard atomic weight40.078atomic mass units (Da)
Mass in kilograms6.6551085 × 10^-26
Categoryalkaline earth
Group2
Period4
Blocks-block
Electrons in a neutral atom20
Neutrons in the most common isotope20≈
Quantities
Molar mass40.078 g/mol
Mass of one mole40.078 grams
Atoms in one gram1.5026051 × 10^22
Mass of one atom6.6551085 × 10^-23 g
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