Strontium (Sr)
Strontium (Sr, element 38) is an alkaline earth metal in group 2, period 5. Atomic mass 87.62, electron configuration [Kr] 5s², uses and facts.
About Strontium
Strontium is an alkaline earth metal with the symbol Sr and atomic number 38. It is a solid at room temperature, and it sits in group 2, period 5 of the periodic table. Strontium was discovered in 1790 by Adair Crawford.
Strontium key facts
- Atomic number: 38
- Symbol: Sr
- Atomic mass: 87.62 u
- Category: alkaline earth metal
- Group: 2
- Period: 5
- State at room temperature: solid
- Electron configuration: [Kr] 5s²
- Electronegativity (Pauling): 0.95
- Melting point: 1050 K (776.85 °C)
- Boiling point: 1655 K (1381.85 °C)
- Density: 2.64 g/cm³
- Common oxidation states: +2
Electron configuration
The electron configuration of strontium is [Kr] 5s². The part in brackets is the noble gas core; the rest shows how the outer electrons fill their subshells. Strontium has 2 valence electrons.
Uses of strontium
- Fireworks (red)
- CRT displays
- Medical imaging
Did you know?
Strontium compounds give fireworks their brilliant red color.
Other elements in group 2 and neighbours
Frequently asked questions
What is the atomic number of strontium?
The atomic number of strontium is 38, which means every strontium atom has 38 protons.
What is the electron configuration of strontium?
The electron configuration of strontium is [Kr] 5s².
What group and period is strontium in?
Strontium is an alkaline earth metal in group 2, period 5.
What state is strontium at room temperature?
Strontium is a solid at room temperature.
What is strontium used for?
Strontium is used for fireworks (red), CRT displays, medical imaging.