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    Dubnium

    Transition Metal

    Atomic Number: 105 • Atomic Mass: 268.0000 u • Period: 7 • Group: 5

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d³
    Phase: Solid
    Electronegativity: 1.3
    Rutherfordium (Rf)Seaborgium (Sg)
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    Physical & Chemical Properties

    Physical Properties

    • •Expected to be a dense, heavy metal
    • •All isotopes are synthetic
    • •Extremely radioactive
    Melting Point

    2150 K (1876.85 °C, 3410.33 °F)

    Boiling Point

    5900 K (5626.85 °C, 10160.33 °F)

    Density

    29.3 g/cm³

    Electronegativity

    1.3 (Pauling scale)

    Chemical Properties

    • •Expected to behave like tantalum
    • •Forms +5 oxidation state
    • •Limited chemical studies due to short half-life

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d³

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