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    Co

    Cobalt

    Transition Metal

    Atomic Number: 27 • Atomic Mass: 58.9330 u • Period: 4 • Group: 9

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷
    Phase: Solid
    Electronegativity: 1.88
    Iron (Fe)Nickel (Ni)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Overview

    Cobalt is the chemical element with the symbol Co and atomic number 27. It belongs to the Transition Metal group and is located in period 4 of the periodic table. It exists as a solid under standard conditions.

    Basic Information

    • Symbol:Co
    • Atomic Number:27
    • Atomic Mass:58.9330 u
    • Group:9
    • Period:4
    • Category:Transition Metal
    • Phase at STP:Solid
    • Electronegativity:1.88 (Pauling scale)

    Key Facts

    Fun Fact #1

    Named after kobold (goblin)

    Fun Fact #2

    Essential for vitamin B12

    Common Uses

    • Batteries
    • Magnets
    • Alloys