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Thulium (symbol Tm) is a chemical element, atomic number 69 on the periodic table.

Characteristics and historyEdit

Thulium has an atomic mass of 168.934, and was discovered by Humans on Earth's European continent for the first time by scientists working in Sweden in the year 1879. This element is part of the lanthanide series of heavy elements. (ST reference: Star Fleet Medical Reference Manual)

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