Home 81 Tl Thallium back to the periodic table
 
Atomic number   81
Symbol   Tl
Atomic weight   204.3833
Density [g/cm3]   11.58
Melting point [°C]   303.5
Boiling point [°C]   1457
1st Ionization energy [eV]   6.108
Electronic configuration   [Xe] 4f14 5d10  6s2 6p
Oxidation number (most stable)   3, 1
Atomic radius [pm]   170.4 (a)
Ionic radius [pm]   150 (1+)
Abundance in crustal rocks [ppm]   0.7
Origin of the name   (greek) thallos = green twig (after its green spectral line)
Discovery   1861 by the English Crookes
Uses   limited technical significance, among other things in some babbitt metals as well as for the production of anodes for the copper electrolysis.
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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