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(B) The maximum number of electrons that can be accommodated in a subshell is given by the formula $2(2l + 1)$.For a $d$-subshell,the azimuthal quantu

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$10$

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(B) The maximum number of electrons that can be accommodated in a subshell is given by the formula $2(2l + 1)$.For a $d$-subshell,the azimuthal quantum number $l = 2$.Substituting this value into the formula: $2(2 	imes 2 + 1) = 2(4 + 1) = 2(5) = 10$.Alternatively,there are $5$ orbitals in a $d$-subshell,and each orbital can hold a maximum of $2$ electrons according to the Pauli Exclusion Principle.Therefore,the total number of electrons is $5 	imes 2 = 10$.

Maximum electrons in a $d$-subshell are

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