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

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

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