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36.6 x 36.6 cm ⏐ 14.4 x 14.4 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Thulium. Sample of the rare earth metal Thulium (Tm). The rare earth metals, or rare earth elements, are a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides plus scandium and yttrium. Thulium is a soft silvery-grey metallic element. It is used in X-ray devices and solid-state lasers.
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