(B) The $M$ shell corresponds to the $n=3$ principal energy level.For an element to have $13$ electrons in the $M$ shell, the electronic configuration

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(B) The $M$ shell corresponds to the $n=3$ principal energy level.For an element to have $13$ electrons in the $M$ shell, the electronic configuration must include $3s^2, 3p^6, 3d^5$.Considering the Aufbau principle and stability, the configuration is $1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^5, 4s^1$.The total number of electrons is $2+2+6+2+6+5+1 = 24$.The element with atomic number $24$ is chromium $(Cr)$.

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

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In the ground state, an element has $13$ electrons in the $M$ shell. The element is

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copper
B
chromium
C
nickel
D
iron

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Structure of Atom

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Quantum number, Electronic configuration and Shape of orbitals

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Identify the impossible quantum number set for an electron from the following:

MediumTS EAMCET 2023

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Identify the element if its expected electronic configuration is $[Ar] 3d^{10} 4s^{2}$.

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Match List-$I$ with List-$II$.

List-$I$ (Quantum Number) List-$II$ (Information provided)

$A$. $m_l$ $I$. Shape of orbital

$B$. $m_s$ $II$. Size of orbital

$C$. $l$ $III$. Orientation of orbital

$D$. $n$ $IV$. Orientation of spin of electron

Choose the correct answer from the options given below:

List-$I$ (Quantum Number)	List-$II$ (Information provided)
$A$. $m_l$	$I$. Shape of orbital
$B$. $m_s$	$II$. Size of orbital
$C$. $l$	$III$. Orientation of orbital
$D$. $n$	$IV$. Orientation of spin of electron

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Identify the elements represented by the following electronic configurations:
$(a)$ $[He] \, 2s^1$
$(b)$ $[Ne] \, 3s^2 \, 3p^3$
$(c)$ $[Ar] \, 4s^2 \, 3d^1$

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In the following two plots,$\psi^2$ is plotted against the distance '$r$' from the nucleus. Select the correct statement.

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In the ground state, an element has $13$ electrons in the $M$ shell. The element is

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Identify the elements represented by the following electronic configurations:
$(a)$ $[He] \, 2s^1$
$(b)$ $[Ne] \, 3s^2 \, 3p^3$
$(c)$ $[Ar] \, 4s^2 \, 3d^1$