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    Fr

    Francium

    Alkali Metal

    Atomic Number: 87 • Atomic Mass: 223.0000 u • Period: 7 • Group: 1

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s¹
    Phase: Solid
    Electronegativity: 0.7
    Radon (Rn)Radium (Ra)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Overview

    Francium is the chemical element with the symbol Fr and atomic number 87. It belongs to the Alkali Metal group and is located in period 7 of the periodic table. It exists as a solid under standard conditions.

    Basic Information

    • Symbol:Fr
    • Atomic Number:87
    • Atomic Mass:223.0000 u
    • Group:1
    • Period:7
    • Category:Alkali Metal
    • Phase at STP:Solid
    • Electronegativity:0.7 (Pauling scale)

    Key Facts

    Fun Fact #1

    Extremely radioactive

    Fun Fact #2

    Named after France

    Fun Fact #3

    Only 20-30 grams exist in Earth's crust at any time

    Common Uses

    • Research
    • Nuclear applications (theoretical)
    • Medical imaging