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38
Sr
87.62
Strontium
Alkaline earth metals · Group 2 · Period 5
Atomic properties
| Atomic number | 38 |
|---|---|
| Symbol | Sr |
| Standard atomic weight | 87.62 |
| Classification | Alkaline earth metals |
| Group | 2 |
| Period | 5 |
| Block | s-block |
| Electron configuration | [Kr] 5s2 |
| Electronegativity (Pauling) | 0.95 |
| Common oxidation states | +2 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 2.64 g/cm³ |
| Melting point | 777 °C |
| Boiling point | 1377 °C |
| Discovered | 1790 |
| CAS number | — |