In the ground state,an element has 13 electro | vedclass

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(B) $M$ shell corresponds to the $n = 3$ shell.For an element to have $13$ electrons in the $M$ shell,the configuration must include $3s^2, 3p^6, 3d^5

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chromium

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(B) $M$ shell corresponds to the $n = 3$ shell.For an element to have $13$ electrons in the $M$ shell,the configuration must include $3s^2, 3p^6, 3d^5$.This corresponds to the electronic configuration: $1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 3d^5, 4s^1$.The total number of electrons is $2 + 2 + 6 + 2 + 6 + 5 + 1 = 24$.The element with atomic number $24$ is $	ext{Chromium}$ $(Cr)$.

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

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