Per Teodor Cleve: The Story of Thulium and Holmium
What lies behind the names thulium and holmium?
Step into the world of nineteenth-century chemistry with Per Teodor Cleve. This historical dramatization explores his work on erbia, an erbium oxide preparation containing other rare-earth elements, and the origins of the names “holmia” and “thulia”: one linked to Stockholm, the other to the ancient northern land of Thule.
Historical context
Thulium was first isolated as its oxide by Cleve in 1879. Holmium had been detected spectroscopically by Marc Delafontaine and Louis Soret in 1878 and was also independently investigated by Cleve. These discoveries concerned the identification and separation of rare-earth compounds, not the isolation of pure metals.
Sources and image credits
https://periodic-table.rsc.org/element/69/thulium
https://periodic-table.rsc.org/element/67/holmium
Historical recreation
This video uses an AI-generated historical character and voice. The first-person narration is a dramatization, not an authentic recording or a verbatim historical quotation.
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