Atomic Number
38
Strontium is a chemical element with symbol Sr and atomic number 38. An alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly chemically reactive. Humphry Davy first isolated the pure metal in 1808 after earlier studies of strontium minerals from Scotland.
38
87.62 u
alkaline earth
solid
2.64 g/cm³
2, 8, 18, 8, 2
Protons: 38 • Electrons: 38 • Neutrons: Varies by isotope
Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s²
1808 • Humphry Davy