Chemical Elements.com - Lutetium (Lu)

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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

Number of Energy Levels: 6

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

Sixth Energy Level:

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

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