If an atom has electronic configuration 1s^2 | vedclass

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(C) The electronic configuration is $1s^2 2s^2 2p^6 3s^2 3p^6 3d^3 4s^2$,which can be rearranged as $[Ar] 3d^3 4s^2$. For $d$-block elements,the group

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Fifth group

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(C) The electronic configuration is $1s^2 2s^2 2p^6 3s^2 3p^6 3d^3 4s^2$,which can be rearranged as $[Ar] 3d^3 4s^2$. For $d$-block elements,the group number is determined by the sum of $(n-1)d$ electrons and $ns$ electrons. Here,the number of electrons in the $(n-1)d$ subshell is $3$ and in the $ns$ subshell is $2$. Total electrons = $3 + 2 = 5$. Therefore,the element belongs to the $5^{th}$ group.

If an atom has electronic configuration $1s^2 2s^2 2p^6 3s^2 3p^6 3d^3 4s^2$,it will be placed in :-

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