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.
Experiment with the elements
Strontium doesn't form any compounds in our lab yet, but the periodic table sandbox lets you combine dozens of other real elements into real compounds — water, table salt, ammonia and many more — with their true chemical formulas.