Among the following, the configuration $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5} 4 s^{1}$ is valid for the :

A
ground state of chlorine
B
excited state of chlorine
C
excited state of argon
D
excited state of $s^{2 -}$ ion

Solution:

For argon, the excited-state electron configuration is,

$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5} 4 s^{1}$

Thus, the option C is correct for the given configuration.

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