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The Columbia Encyclopedia, Sixth Edition.  2001-07.
 
Periodic Table of the Elements: Thulium
 
 
Atomic Number:Atomic Number:69
Atomic Symbol:Atomic Symbol:Tm
 Name of Element:Thulium
Atomic Weight:Atomic Weight:168.9342
ElectronConfiguration:Electron Configuration:2 · 8 · 1831 · 8 · 2
 
 
The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press.

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