38 · Sr
Strontium
Earth recognized by Crawford in 1790, metal isolated by Davy in 1808.
Identity
- Atomic number
- 38
- Symbol
- Sr
- Canonical name
- Strontium
- Category
- alkaline earth metal
- Group
- 2
- Period
- 5
- 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
- 87.621 u
- Electron configuration
- [Kr] 5s2
- Electrons per shell
- 2, 8, 18, 8, 2
- Standard state
- solid
- Density
- 2.64 g/cm³
- Melting point
- 1,050 K
- Boiling point
- 1,650 K
- Electronegativity
- 0.95 Pauling
- First ionization energy
- 549.5 kJ/mol
- Electron affinity
- 5.023 kJ/mol
History
An earth distinct from baryta
Identification · confirmed · 1790
Crawford recognizes that strontianite is not a barium ore.
Metal isolated
Isolation · confirmed · 1808
Davy isolates strontium. Recognizing the earth in 1790 was not this isolation.
Etymology
- Theme
- place
- Language
- gaélique
- Root
- Strontian
- Meaning
- Strontian, Scotland
Scientists
Places and institutions
- Strontian — historical setting : United Kingdom — present country : United Kingdom Highland village where strontianite was recognized.
- 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