4s^2 is the configuration of the outermost or | vedclass

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(C) The electronic configuration of the elements provided in the options are as follows:$Cu (Z=29): 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^{10}$$Cr (Z=24):

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(C) The electronic configuration of the elements provided in the options are as follows:$Cu (Z=29): 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^{10}$$Cr (Z=24): 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^5$$Zn (Z=30): 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10}$$K (Z=19): 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1$Among the given options,only $Zn$ $(Z=30)$ has a $4s^2$ configuration in its outermost shell.

$4s^2$ is the configuration of the outermost orbit of an element. Its atomic number would be $:-$

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