[en] Cocrystallization experiments reported previously indicated a monovalent state existed for Md. Some of these experiments were repeated recently and a series of new ones was performed in which an attempt was made 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 SmF₂/SmF₃, 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, it is concluded that Md cannot be reduced to a monovalent oxidation state with Sm²⁺ and that the earlier claim for Md(I) is unsubstantiated. (author)