38 Sr 87.621
Strontium
alkaline earth metal
Properties
- Atomic number
- 38
- Atomic mass
- 87.621 u
- Category
- alkaline earth metal
- Group
- 2
- Period
- 5
- Block
- s-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- 0.95 (Pauling)
- Density
- 2.64 g/cm³
- Melting point
- 776.85 °C
- Boiling point
- 1376.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s²
Noble-gas shorthand: [Kr] 5s²
Electrons per shell: 2, 8, 18, 8, 2, which is 2 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
About Strontium
Strontium is a chemical element with symbol Sr and atomic number 38. An alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically. The metal turns yellow when it is exposed to air.
- Discovered by William Cruickshank (chemist)
Strontium: frequently asked questions
- What is Strontium?
- Strontium (Sr) is the chemical element with atomic number 38. It is a metal: specifically an alkaline earth metal.
- What is the atomic number of Strontium?
- Strontium's atomic number is 38, which means every Strontium atom has 38 protons in its nucleus.
- What is the electron configuration of Strontium?
- The electron configuration of Strontium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 (noble-gas shorthand: [Kr] 5s2). Its electrons are arranged in shells of 2, 8, 18, 8, 2, with 2 in the outermost shell.
- Is Strontium a metal or a nonmetal?
- Strontium is a metal: specifically an alkaline earth metal.
- What group and period is Strontium in?
- Strontium is in group 2 and period 5 of the periodic table.
- Is Strontium a solid, liquid, or gas?
- At room temperature, Strontium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.