The atomic numbers of elements X, Y and Z are | vedclass

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(C) The electronic configurations of the elements are as follows:$X (Z=19): 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^1$ (or $2, 8, 8, 1$)$Y (Z=21): 1s^2, 2s^2

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$Z > Y > X$

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(C) The electronic configurations of the elements are as follows:$X (Z=19): 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^1$ (or $2, 8, 8, 1$)$Y (Z=21): 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^1, 4s^2$ (or $2, 8, 9, 2$)$Z (Z=25): 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^5, 4s^2$ (or $2, 8, 13, 2$)The $M$-shell corresponds to the $n=3$ principal quantum level.For $X$,the number of electrons in the $M$-shell $(3s^2, 3p^6)$ is $8$.For $Y$,the number of electrons in the $M$-shell $(3s^2, 3p^6, 3d^1)$ is $9$.For $Z$,the number of electrons in the $M$-shell $(3s^2, 3p^6, 3d^5)$ is $13$.Thus,the order of electrons in the $M$-shell is $Z (13) > Y (9) > X (8)$.

The atomic numbers of elements $X, Y$ and $Z$ are $19, 21$ and $25$ respectively. The number of electrons present in the $M$-shell of these elements follow the order:

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