Hierro (Fe), Rutenio (Ru), Osmio (Os) y Hassio (Hs). Estos metales presentan 8 electrones de valencia: 2 electrones de la penultima
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Hierro (Fe), Rutenio (Ru), Osmio (Os) y Hassio (Hs). Estos metales presentan 8 electrones de valencia: 2 electrones de la penultima