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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 :

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ground state of chlorine

excited state of chlorine

excited state of argon

excited state of

s^{2 -}

ion

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detailed solution

Correct option is C

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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Among the following, the configuration 1s2 2s2 2p6 3s2 3p54s1 is valid for the :