masurium

The name given to the first chemical element to be synthesized in the laboratory, element 43, now known as technetium, by the German chemist Ida Tacke Noddack, when she claimed to have isolated it in 1925. She was mistaken.

Roberto Zingales.
From Masurium to Trinacrium: The Troubled Story of Element 43.
Journal of Chemical Education, vol. 82, no. 2, page 221 (1 February 2005).
doi: 10.1021/ed082p221

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