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Strontium (Sr)
Atomic number 38 · alkaline
| Atomic number | 38 |
|---|---|
| Atomic mass | 87.62 u |
| Molar mass | 87.62 g/mol |
| Category | alkaline |
| Group / period / block | 2 / 5 / s |
| Electron configuration | [Kr] 5s2 |
| Electrons per shell | 2, 8, 18, 8, 2 |
| Electronegativity (Pauling) | 0.95 |
| Atomic radius | 200.0 pm |
| Density | 2.64 g/cm³ |
| First ionisation energy | 5.6949 eV |
| Melting point | 1050.15 K (777.00 °C) |
| Boiling point | 1650.15 K (1377.00 °C) |
| Common oxidation states | +2 |
| Abundance in Earth's crust | 370 ppm |
Uses
Red fireworks, glow-in-the-dark paint
Discovery
1790, A. Crawford