20 · Ca
Calcium
Isolated by Davy in 1808.
Identity
- Atomic number
- 20
- Symbol
- Ca
- Canonical name
- Calcium
- Category
- alkaline earth metal
- Group
- 2
- Period
- 4
- Block
- s
Properties
These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.
- Atomic mass
- 40.0784 u
- Electron configuration
- [Ar] 4s2
- Electrons per shell
- 2, 8, 8, 2
- Standard state
- solid
- Density
- 1.55 g/cm³
- Melting point
- 1,115 K
- Boiling point
- 1,757 K
- Electronegativity
- 1 Pauling
- First ionization energy
- 589.8 kJ/mol
- Electron affinity
- 2.37 kJ/mol
History
Electrolytic isolation
Isolation · confirmed · 1808
Davy isolates calcium. Lime was known as an earth, not as the free metal.
Etymology
- Theme
- mineral
- Language
- latin
- Root
- calx
- Meaning
- lime
Scientists
Places and institutions
- London — historical setting : United Kingdom — present country : United Kingdom
See also
Sources
- IUPAC, Periodic Table of the Elements
- Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
- John Emsley, Nature’s Building Blocks: An A–Z Guide to the Elements