A) \[~1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}4{{s}^{2}}\]
B) \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}4{{s}^{2}}4{{p}^{1}}\]
C) \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{p}^{6}}3{{d}^{10}}4{{s}^{2}}4{{p}^{6}}\]
D) \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{2}}4{{s}^{2}}\]
Correct Answer: D
Solution :
Outer energy level of the transition element contain 1 or 2 electron and the penultimate orbit contain 9 to 18 electrons. So, option [d] is electronic configuration of transition element.
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