38Solid
Sr 87.62 Atomic mass · uAlkaline earth metals
Strontium
Strontium is a chemical element with symbol Sr and atomic number 38. An alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically. The metal turns yellow when it is exposed to air.
Discovery 1790 (William Cruickshank (chemist))
K2L8M18N8O2
Physical properties
Values for the element in its standard state.
- Density
- 2.63g/cm³
- Melting point
- 1,050K
- Boiling point
- 1,655K
- Atomic radius
- 192pm
- Bonding type
- Metallic
- Molar heat
- 26.4J/(mol·K)
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 5s, 2 electrons;
[Kr] represents 36 core electrons. The full view shows them explicitly.
38 electrons Orbital order preserved from source
- Electronegativity
- 0.95Pauling scale
- First ionization energy
- 550kJ/mol
- Electron affinity
- 5kJ/mol
- Van der Waals radius
- Not available
Sr StrontiumAtomic number 38
550kJ/mol
Atomic numberGaps indicate unavailable data
About strontium
- Appearance
- Not recorded
- Discovery
- 1790 (William Cruickshank (chemist))
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.