Strontium (Sr)
Strontium
Strontium (Sr) is an alkaline earth metal in period 5, group 2. Its relative atomic mass is 87.62 and the molar mass of the atom is 87.62 g/mol.
Atomic number 38
Atomic mass 87.62
Molar mass 87.62 g/mol
Category Alkaline earth metal Solid
Properties of strontium
| Atomic number | 38 |
|---|---|
| Symbol | Sr |
| Latin name | Strontium |
| Relative atomic mass | 87.62 |
| Molar mass | 87.62 g/mol |
| Group, period, block | 2, 5, s |
| Category | Alkaline earth metal |
| State at 20 °C | Solid |
| Electron configuration | [Kr] 5s² |
| Electronegativity (Pauling) | 0.95 |
| Atomic radius | 200 pm |
Electron configuration of strontium
Electrons per shell
K2L8M18N8O2
Full notation
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 5s²
Noble-gas notation
38 protons · 38 electrons[Kr] 5s²
Formula and compounds of strontium
Simple substanceSrstrontiumMolar mass of Sr: 87.62 g/mol
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Frequently asked questions
The relative atomic mass of strontium is 87.62, so the molar mass of the atom is 87.62 g/mol.
Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 5s². Noble-gas notation: [Kr] 5s².