38Sr87.62
Strontium (Sr)
Element 38 Ā· Alkaline earth metal
Strontium (Sr) is a chemical element with atomic number 38. It is classified as an alkaline earth metal in period 5, group 2 of the periodic table (the s-block). Its standard atomic weight is 87.62 u and its ground-state electron configuration is [Kr] 5sĀ².
Strontium facts
| Atomic number (Z) | 38 |
|---|---|
| Symbol | Sr |
| Standard atomic weight | 87.62 u |
| Category | Alkaline earth metal |
| Group | 2 |
| Period | 5 |
| Block | s-block |
| Electron configuration | [Kr] 5sĀ² |
| Electronegativity (Pauling) | 0.95 |
| State at 20 Ā°C | Solid |
| Protons / electrons | 38 / 38 |
| Neutrons (most common isotope, approx.) | 50 |
| Molar mass | 87.62 g/mol |