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    Ra

    Radium

    Alkaline Earth

    Atomic Number: 88 • Atomic Mass: 226.0000 u • Period: 7 • Group: 2

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s²
    Phase: Solid
    Electronegativity: 0.9
    Francium (Fr)Actinium (Ac)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Overview

    Radium is the chemical element with the symbol Ra and atomic number 88. It belongs to the Alkaline Earth group and is located in period 7 of the periodic table. It exists as a solid under standard conditions.

    Basic Information

    • Symbol:Ra
    • Atomic Number:88
    • Atomic Mass:226.0000 u
    • Group:2
    • Period:7
    • Category:Alkaline Earth
    • Phase at STP:Solid
    • Electronegativity:0.9 (Pauling scale)

    Key Facts

    Fun Fact #1

    Discovered by Marie and Pierre Curie

    Fun Fact #2

    Glows in the dark due to radioactivity

    Common Uses

    • Cancer treatment (historical)
    • Luminous paint (historical)
    • Neutron source