Which of the following elements has the least | vedclass

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(A) The electronic configurations are as follows:$K$ $(Z=19)$: $1s^2, 2s^2 2p^6, 3s^2 3p^6, 4s^1$. Electrons in $M$ shell $(n=3)$ = $8$.$Mn$ $(Z=25)$:

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$K$

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(A) The electronic configurations are as follows:$K$ $(Z=19)$: $1s^2, 2s^2 2p^6, 3s^2 3p^6, 4s^1$. Electrons in $M$ shell $(n=3)$ = $8$.$Mn$ $(Z=25)$: $1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^5, 4s^2$. Electrons in $M$ shell $(n=3)$ = $13$.$Ni$ $(Z=28)$: $1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^8, 4s^2$. Electrons in $M$ shell $(n=3)$ = $16$.$Sc$ $(Z=21)$: $1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^1, 4s^2$. Electrons in $M$ shell $(n=3)$ = $9$.Thus,$K$ has the least number of electrons in its $M$ shell.

Which of the following elements has the least number of electrons in its $M$ shell?

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