Thulium

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Thulium (play /ˈθjliəm/ THEW-lee-əm) is a chemical element that has the symbol Tm and atomic number 69. Thulium is the least abundant of the lanthanides (promethium is less abundant than thulium, but it is not found naturally on Earth). It is an easily workable metal with a bright silvery-gray luster. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices and in solid-state lasers.

Contents

Properties

Physical properties

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