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    Al

    Aluminum

    Post Transition

    Atomic Number: 13 • Atomic Mass: 26.9820 u • Period: 3 • Group: 13

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p¹
    Phase: Solid
    Electronegativity: 1.61
    Magnesium (Mg)Silicon (Si)
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    Occurrence

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

    • Most abundant metal in Earth's crust (8.1%)
    • Third most abundant element in Earth's crust after oxygen and silicon
    • Found in over 270 different minerals, most commonly as bauxite
    • Never found as pure metal in nature due to reactivity