A) \[1{{s}^{2}},\ 2{{s}^{2}}2{{p}^{6}},\ 3{{s}^{2}},\ 3{{p}^{6}},\ 4{{s}^{2}}\]
B) \[1{{s}^{2}},\ 2{{s}^{2}}2{{p}^{6}},\ 3{{s}^{2}},\ 3{{p}^{6}}3{{d}^{2}},\ 4{{s}^{2}}\]
C) \[1{{s}^{2}},\ 2{{s}^{2}}2{{p}^{6}},\ 3{{s}^{2}},\ 3{{p}^{6}}3{{d}^{10}},\ 4{{s}^{2}}4{{p}^{2}}\]
D) \[1{{s}^{2}},\ 2{{s}^{2}}2{{p}^{6}},\ 3{{s}^{2}},\ 3{{p}^{6}}3{{d}^{10}},\ 4{{s}^{2}}4{{p}^{1}}\]
Correct Answer: B
Solution :
We know that transition element are those element which have partially filled d-subshell in their elementary form. Therefore, the general electronic configuration of d-block element is \[(n-1)\ {{d}^{1-10}}n{{s}^{1-2}}\].
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