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Per Teodor Cleve concludes in 1882 that …
Years: 1882 - 1882
Per Teodor Cleve concludes in 1882 that Mosander's didymia (from which are eventually isolated praseodymium and neodymium) is a complex earth, i.e., a mixture of several rare-earth oxides.
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Years: 1882 - 1882
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