Thulium: historical information

Thulium was discovered by Per Theodore Cleve at 1879 in Sweden. Origin of name: named after ""Thule", an ancient name for Scandinavia.

Per Theodor Cleve of Sweden discovered holmium in 1879 while working on erbia earth (erbium oxide). Thulium oxide (holmia) was present as an impurity in the erbia. The element is named after Thule, the ancient name for Scandinavia.

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thulium atomic number