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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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    Physical & Chemical Properties

    Physical Properties

    • •Silvery-white, soft, non-magnetic metal
    • •Low density
    • •Excellent thermal and electrical conductor
    • •Highly malleable and ductile
    Melting Point

    933.47 K (660.32 °C, 1220.58 °F)

    Boiling Point

    2792 K (2518.85 °C, 4565.93 °F)

    Density

    2.7 g/cm³

    Electronegativity

    1.61 (Pauling scale)

    Chemical Properties

    • •Protected by thin oxide layer that forms rapidly in air
    • •Amphoteric (reacts with both acids and bases)
    • •Highly reactive without its oxide layer
    • •Good reducing agent

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p¹

    Electron configuration describes how electrons are distributed in atomic orbitals, showing how they are arranged in energy levels and subshells.