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    Be

    Beryllium

    Alkaline Earth

    Atomic Number: 4 • Atomic Mass: 9.0122 u • Period: 2 • Group: 2

    Electron Configuration: 1s² 2s²
    Phase: Solid
    Electronegativity: 1.57
    Lithium (Li)Boron (B)
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    Physical & Chemical Properties

    Physical Properties

    • •Steel-gray, strong, lightweight metal
    • •High melting point relative to its atomic number
    • •Excellent thermal conductor
    • •Low density but high stiffness
    Melting Point

    1560 K (1286.85 °C, 2348.33 °F)

    Boiling Point

    2742 K (2468.85 °C, 4475.93 °F)

    Density

    1.85 g/cm³

    Electronegativity

    1.57 (Pauling scale)

    Chemical Properties

    • •Relatively unreactive due to oxide layer formation
    • •Resistant to oxidation at ordinary temperatures
    • •Does not react with water or steam
    • •Reacts with acids and bases

    Electron Configuration

    1s² 2s²

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