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    Sr

    Strontium

    Alkaline Earth

    Atomic Number: 38 • Atomic Mass: 87.6200 u • Period: 5 • Group: 2

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s²
    Phase: Solid
    Electronegativity: 0.95
    Rubidium (Rb)Yttrium (Y)
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    Occurrence

    Strontium is found in various natural sources, including minerals, rocks, and the Earth's crust.

    • 15th most abundant element in Earth's crust (0.036%)
    • Never found in pure form due to reactivity
    • Main minerals include celestine (strontium sulfate) and strontianite (strontium carbonate)
    • Small amounts present in seawater
    • Present in bones and teeth of animals, replacing some calcium