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    Ar

    Argon

    Noble Gas

    Atomic Number: 18 • Atomic Mass: 39.9480 u • Period: 3 • Group: 18

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶
    Phase: Gas
    Electronegativity: 0
    Chlorine (Cl)Potassium (K)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Overview

    Argon is the chemical element with the symbol Ar and atomic number 18. It belongs to the Noble Gas group and is located in period 3 of the periodic table. It exists as a gas under standard conditions.

    Basic Information

    • Symbol:Ar
    • Atomic Number:18
    • Atomic Mass:39.9480 u
    • Group:18
    • Period:3
    • Category:Noble Gas
    • Phase at STP:Gas
    • Electronegativity:0 (Pauling scale)

    Key Facts

    Fun Fact #1

    Third most abundant gas in Earth's atmosphere

    Fun Fact #2

    Used in blue neon lights

    Common Uses

    • Welding
    • Light bulbs
    • Lasers