Back to Elements
    Lu

    Lutetium

    Lanthanide

    Atomic Number: 71 • Atomic Mass: 174.9700 u • Period: 6 • Group: 101

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹
    Phase: Solid
    Electronegativity: 1.27
    Ytterbium (Yb)Hafnium (Hf)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Overview

    Lutetium is the chemical element with the symbol Lu and atomic number 71. 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:Lu
    • Atomic Number:71
    • Atomic Mass:174.9700 u
    • Group:101
    • Period:6
    • Category:Lanthanide
    • Phase at STP:Solid
    • Electronegativity:1.27 (Pauling scale)

    Key Facts

    Fun Fact #1

    Named after Lutetia, the ancient name of Paris

    Fun Fact #2

    Hardest and densest lanthanide

    Common Uses

    • PET scan detectors
    • Petroleum cracking
    • LED bulbs