(C) The electronic configurations of the elements are as follows:For $X$ $(Z=19)$: $1s^2 2s^2 2p^6 3s^2 3p^6 4s^1$. The $M$-shell $(n=3)$ contains $2+

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

Class 11 Chemistry Structure of Atom Quantum number, Electronic configuration and Shape of orbitals

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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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A
$Z > X > Y$
B
$X > Y > Z$
C
$Z > Y > X$
D
$Y > Z > X$

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Structure of Atom

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Quantum number, Electronic configuration and Shape of orbitals

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In an element with atomic number $(Z) = 25$,the number of electrons with $(n+l)$ value equal to $3$ and $4$ are $x$ and $y$ respectively. The value of $(x+y)$ is

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The allowed set of quantum numbers for an electron in a hydrogen atom is

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Given below are two statements:
Statement-$I$: The orbitals having same energy are called as degenerate orbitals.
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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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