(A) The general electronic configuration of $d-$block elements is $(n-1)d^{1-10} ns^{0-2}$.Here,the penultimate shell is the $(n-1)$ shell.The electro

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(A) The general electronic configuration of $d-$block elements is $(n-1)d^{1-10} ns^{0-2}$.Here,the penultimate shell is the $(n-1)$ shell.The electrons present in the $(n-1)$ shell are $(n-1)s^2$,$(n-1)p^6$,and $(n-1)d^{1-10}$.Summing these,we get $2 + 6 + (1 \text{ to } 10) = 9$ to $18$ electrons.