Atomic Structure Question 278
Question: The electronic configuration of the element of atomic number 27 is
Options:
A) $ 1s^{2},\ 2s^{2}2p^{6},\ 3s^{2}3p^{6},\ 4s\ (\uparrow \downarrow )\ 4p\ (\uparrow \downarrow )(\uparrow \downarrow )(\uparrow \downarrow )\ 5s\ (\uparrow ) $
B) $ 1s^{2},\ 2s^{2}2p^{6},\ 3s^{2}3p^{6}3d\ (\uparrow \downarrow )(\uparrow \downarrow )(\uparrow \downarrow ),\ 4s\ (\uparrow \downarrow )\ 4p\ (\uparrow ) $
C) $ 1s^{2},\ 2s^{2}2p^{6},\ 3s^{2}3p^{6},\ 3d\ (\uparrow \downarrow )(\uparrow \downarrow )(\uparrow \downarrow )(\uparrow \downarrow ),\ 4s\ (\uparrow ) $
D) $ 1s^{2},\ 2s^{2}2p^{6},\ 3s^{2}3p^{6},\ 3d\ (\uparrow \downarrow )(\uparrow \downarrow )(\uparrow )(\uparrow )(\uparrow )\ 4s\ (\uparrow \downarrow ) $
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Answer:
Correct Answer: D
Solution:
According to Aufbau-s rule.
