D-block (for diffuse) elements consist of the transition metals (group 3-12 on the periodic table) in which the outermost electron shell is the D orbital. D-block elements form at least one stable ion with an incompletely filled electron subshell.
... of Charles Delestraint[?].
Bureau d'Opérations Aériennes[?] (BOA) - Service for arranging clandestine air operations in northern France.
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