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Thulium is a chemical element with symbol Tm and atomic quantity sixty nine. it is the 13th and antepenultimate detail in the lanthanide collection. just like the different lanthanides, the most not unusual oxidation kingdom is +three, visible in its oxide, halides and different compounds; because of its position because the 0.33-ultimate of the collection, but, the +2 oxidation kingdom is likewise stabilized by using the nearly full 4f shell that results. In aqueous solution, like compounds of different overdue lanthanides, soluble thulium compounds form coordination complexes with nine water molecules.
Thulium is the second one least plentiful of the lanthanides after promethium, which is most effective discovered in trace quantities on the earth. it is an effortlessly potential metal with a shiny silvery-grey luster. It within reason smooth and slowly tarnishes in air. notwithstanding its excessive rate and rarity, thulium is used as the radiation supply in portable X-ray gadgets, and in a few strong-state lasers. It has no large organic role and is not specifically poisonous.
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