38 Sr
Alkaline earth metal
Strontium
Red color in fireworks.
Properties of Strontium
- Atomic number (Z)
- 38
- Symbol
- Sr
- Atomic mass
- 87.62 g/mol
- Category
- Alkaline earth metal
- Group
- 2
- Period
- 5
- Electron configuration
- [Kr] 5s²
- Electronegativity (Pauling)
- 0.95
- Atomic radius
- 219 pm
- First ionization energy
- 549 kJ/mol
- Melting point
- 1050 K (776.9 °C)
- Boiling point
- 1655 K (1381.8 °C)
- Density
- 2.64 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1790