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    Kr

    Krypton

    Noble Gas

    Atomic Number: 36 • Atomic Mass: 83.7980 u • Period: 4 • Group: 18

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶
    Phase: Gas
    Electronegativity: 3
    Bromine (Br)Rubidium (Rb)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Overview

    Krypton is the chemical element with the symbol Kr and atomic number 36. It belongs to the Noble Gas group and is located in period 4 of the periodic table. It exists as a gas under standard conditions.

    Basic Information

    • Symbol:Kr
    • Atomic Number:36
    • Atomic Mass:83.7980 u
    • Group:18
    • Period:4
    • Category:Noble Gas
    • Phase at STP:Gas
    • Electronegativity:3 (Pauling scale)

    Key Facts

    Fun Fact #1

    Named from Greek word for 'hidden'

    Fun Fact #2

    Used to define the meter from 1960 to 1983

    Common Uses

    • Lighting
    • Laser research
    • Window insulation