Information valid for Tm-169 unless otherwise noted
[ATOM]

Thulium

 [ATOM]

Basic Information


Symbol: Tm
Atomic Number: 69
Mass: 168.934
Melting Point: 1545
Boiling Point: 1727
Number of Protons/Electrons: 69
Number of Neutrons: 100
Classification: Rare Earth
Crystal Structure: Hexagonal
Density: 9.321
Color: silverish

Atomic Structure

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

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 31
    Fifth Energy Level: 8
    Sixth Energy Level: 2

Isotopes

Isotope Half Life
Tm-16893.1 days
Tm-169Stable
Tm-170128.6 days
Tm-1711.92 years
Tm-1722.65 days

Facts


Date of Discovery: 1879
Discoverer: Per Theodor Cleve
Name Origin: From Thule (ancient name of Scandinavia)
Uses: power for portable x-ray machines
Obtained From: gadolinite, euxenite, xenotime

Related Links

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