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In page Thulium:
"Thulium's only known oxide is Tm2O3. This oxide is sometimes called "thulia".[5] Reddish-purple thulium(II) compounds can be made by the reduction of thulium(III) compounds. Examples of thulium(II) compounds include the halides (except the fluoride). Some hydrated thulium compounds, such as TmCl3·7H2O and Tm2(C2O4)3·6H2O are green or greenish-white.[6] Thulium dichloride reacts very vigorously with water. This reaction results in hydrogen gas and Tm(OH)3 exhibiting a fading reddish color.[citation needed] Combination of thulium and chalcogens results in thulium chalcogenides.[7]
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