• # question_answer Which electronic configuration is not observing the ($n+l$) rule A)                 $1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{1}},4{{s}^{2}}$ B)                 $1{{s}^{2}},2{{s}^{2}}s{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{7}},4{{s}^{2}}$ C)                 $1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{5}},4{{s}^{1}}$ D)                 $1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{8}},4{{s}^{2}}$

Solution :

3d subshell filled with 5 electrons (half-filled) is more stable than that filled with 4 electrons. $1,\,4s$ electrons jumps into $3d$ subshell for more sability.

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