38 Sr 87.62
Strontium
Alkaline Earth Metal
Strontium (Sr) is a chemical element with atomic number 38, classified as a alkaline earth metal. At room temperature it is a solid. It was discovered in 1790 by William Cruickshank.
Properties
- Atomic number
- 38
- Atomic mass
- 87.62 u
- Category
- Alkaline Earth Metal
- Group
- 2
- Period
- 5
- Block
- s-block
- Electron configuration
- [Kr] 5s²
- Phase at STP
- Solid
- Density
- 2.64 g/cm³
- Melting point
- 1050 K (776.9 °C)
- Boiling point
- 1655 K (1381.8 °C)
- Electronegativity
- 0.95
- Atomic radius
- 219 pm
- Ionization energy
- 5.695 eV
- Discovery
- 1790 · William Cruickshank
Common uses
Fireworks, flares, magnets, medical treatments
Did you know?
Creates brilliant red color in fireworks and used to treat bone cancer.