A) \[1{{s}^{2}},\ 2{{s}^{2}}2{{p}^{6}},\ 3{{s}^{2}}3{{p}^{6}},\ 4s\ (\uparrow \downarrow )\ 4p\ (\uparrow \downarrow )(\uparrow \downarrow )(\uparrow \downarrow )\ 5s\ (\uparrow )\]
B) \[1{{s}^{2}},\ 2{{s}^{2}}2{{p}^{6}},\ 3{{s}^{2}}3{{p}^{6}}3d\ (\uparrow \downarrow )(\uparrow \downarrow )(\uparrow \downarrow ),\ 4s\ (\uparrow \downarrow )\ 4p\ (\uparrow )\]
C) \[1{{s}^{2}},\ 2{{s}^{2}}2{{p}^{6}},\ 3{{s}^{2}}3{{p}^{6}},\ 3d\ (\uparrow \downarrow )(\uparrow \downarrow )(\uparrow \downarrow )(\uparrow \downarrow ),\ 4s\ (\uparrow )\]
D) \[1{{s}^{2}},\ 2{{s}^{2}}2{{p}^{6}},\ 3{{s}^{2}}3{{p}^{6}},\ 3d\ (\uparrow \downarrow )(\uparrow \downarrow )(\uparrow )(\uparrow )(\uparrow )\ 4s\ (\uparrow \downarrow )\]
Correct Answer: D
Solution :
According to Aufbau?s rule.
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