Lutetium at Chemical Elements.com 


 

Basic Information


Name: Lutetium
Symbol: Lu
Atomic Number: 71
Atomic Mass: 174.967 amu
Melting Point: 1656.0 °C (1929.15 °K, 3012.8 °F)
Boiling Point: 3315.0 °C (3588.15 °K, 5999.0 °F)
Number of Protons/Electrons: 71
Number of Neutrons: 104
Classification: Rare Earth
Crystal Structure: Hexagonal
Density @ 293 K: 9.85 g/cm3
Color: silvery


Atomic Structure

[Bohr Model of Lutetium]  
Number of Energy Levels: 6

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 32
    Fifth Energy Level: 9
    Sixth Energy Level: 2

Isotopes

Isotope Half Life
Lu-172 6.7 days
Lu-172m 3.7 minutes
Lu-173 1.37 years
Lu-174 3.3 years
Lu-174m 142.0 days
Lu-175 Stable
Lu-176 3.6E10 years
Lu-177 6.68 days
Lu-177m 160.7 days

Facts


Date of Discovery: 1907
Discoverer: Georges Urbain
Name Origin: From Lutetia (ancient name of Paris)
Uses: No uses known
Obtained From: gadolinite, xenotime