question_answer 100)

  The pair of ions having same electronic configuration is: (a) \[C{{r}^{3+}},F{{e}^{3+}}\]                    (b) \[F{{e}^{3+}},M{{n}^{2+}}\] (c) \[F{{e}^{3+}},C{{o}^{3+}}\]                   (d) \[S{{c}^{3+}},C{{r}^{3+}}\]

Answer:

  (b) \[F{{e}^{3+}}-1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{5}},4{{s}^{0}}\] \[M{{n}^{2+}}-1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{5}},4{{s}^{0}}\]