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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)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Overview

    Beryllium is the chemical element with the symbol Be and atomic number 4. It belongs to the Alkaline Earth group and is located in period 2 of the periodic table. It exists as a solid under standard conditions.

    Basic Information

    • Symbol:Be
    • Atomic Number:4
    • Atomic Mass:9.0122 u
    • Group:2
    • Period:2
    • Category:Alkaline Earth
    • Phase at STP:Solid
    • Electronegativity:1.57 (Pauling scale)

    Key Facts

    Fun Fact #1

    Toxic and carcinogenic

    Fun Fact #2

    Unusually high thermal conductivity for a metal

    Common Uses

    • X-ray windows
    • Aerospace components
    • Nuclear reactors