Non-observance of monovalent Md

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Abstract

Cocrystallization experiments were reported in 1972 that indicated a monovalent state existed for Md. We recently repeated some of these experiments and performed a series of new ones in which we attempted to prepare Md(I) by reduction with Sm2+ in an ethanolic or fused KCl medium. The oxidation state of Md was determined by the amount of 256Md tracer (≥ 105 atoms) carried on precipitates of SmF2SmCl2, SmCl2, RbCl and Rb2PtCl6. Comparisons of the coprecipitation behavior of Md with the behavior of tracer amounts of the elements Es, Fm, Eu, Sr, Y and Cs showed that Md consistently follows the behavior of Fm2+, Eu2+ and Sr2+, rather than the behavior of Cs+. Therefore, we conclude that Md cannot be reduced to a monovalent oxidation state with Sm2+ and that the earlier claim for Md(I) is unsubstantiated.

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Present address: Chalmers University of Technology, Fack S-40220 Göteborg, Sweden.

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