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Chemistry
Which of the following electronic configuration is not possible?
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Q. Which of the following electronic configuration is not possible?
BHU
BHU 2007
A
$1 s^{2}, 2 s^{2}$
B
$3 d^{10},4 s^{2}, 4 p^{2}$
C
$1 s^{2}, 2 s^{2}, 2 p^{6}$
D
$1 s^{2}, 2 s^{2}, 2 p^{2}, 3 s^{1}$
Solution:
$1 s^{2}, 2 s^{2}, 2 p^{2}, 3 s^{1}$ configuration is not possible because electron cannot goes in $3 s$ orbital without filling $2 p$ subshell.