Home 69 Tm Thulium back to the periodic table
 
Atomic number   69
Symbol   Tm
Atomic weight   168.93421
Density [g/cm3]   9.32
Melting point [°C]   1545
Boiling point [°C]   1730
1st Ionization energy [eV]   6.18
Electronic configuration   [Xe] 4f13 6s2
Oxidation number (most stable)   3, 2
Atomic radius [pm]   174.6
Ionic radius [pm]   87 (3+)
Abundance in crustal rocks [ppm]   0.5
Origin of the name   named after Thule, an ancient name for Scandinavia
Discovery   1879 by the Swede Cleve
Uses   no technical significance.
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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