thuliumn.
/ˈθjuːlɪəm/, U.S. /ˈθ(j)uliəm/ Chemistry.
A rare metallic element of the lanthanide series that forms pale green salts in which it is trivalent. Atomic number 69; symbol Tm.
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thulium1879
1879 P. T. Cleve in Chem. News 12 Sept. 126/2 For the radical of the oxide placed between ytterbia and erbia..I propose the name of Thullium [sic], derived from Thulé, the ancient name of Scandinavia.
1922 Nature 109 781/1 Three lines of thulium were found.
1923 U. R. Evans Metals & Metallic Compounds II. 236 Thulium can be separated in a fairly pure state by oft-repeated recrystallization as bromate.
1924 J. W. Mellor Comprehensive Treat. Inorg. & Theoret. Chem. V. xxxviii. 696 The four rare earth elements—dysprosium, Dy; holmium, Ho; erbium, Er; and thulium, Tm—are considered as a family or sub-group of the yttrium elements.
1956 Nature 17 Mar. 494/2 Iridium-192 continues to be the source most commonly used in industry for gamma-radiography... Thulium-170 has only gained slightly in popularity.
1968 Punch 24 Apr. 604/3 Gold, silver and platinum are starting to look pretty square as well as pricey these days. More sophisticated speculators have already shifted into antimony and zinc: while an avant garde group is believed to have plunged heavily on thulium.
This entry has not yet been fully updated (first published 1933; most recently modified version published online March 2022).
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n.1879