Back to Elements
    Pm

    Promethium

    Lanthanide

    Atomic Number: 61 • Atomic Mass: 145.0000 u • Period: 6 • Group: 101

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁵
    Phase: Solid
    Electronegativity: 1.13
    Neodymium (Nd)Samarium (Sm)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Overview

    Promethium is the chemical element with the symbol Pm and atomic number 61. It belongs to the Lanthanide group and is located in period 6 of the periodic table. It exists as a solid under standard conditions.

    Basic Information

    • Symbol:Pm
    • Atomic Number:61
    • Atomic Mass:145.0000 u
    • Group:101
    • Period:6
    • Category:Lanthanide
    • Phase at STP:Solid
    • Electronegativity:1.13 (Pauling scale)

    Key Facts

    Fun Fact #1

    Named after Prometheus from Greek mythology

    Fun Fact #2

    No stable isotopes exist

    Common Uses

    • Nuclear batteries
    • Luminous paint
    • Thickness measurement devices