(C) For transition elements,the group number is determined by the sum of $(n-1)d$ and $ns$ electrons.Given configuration: $4d^3$ $5s^2$.Number of elec

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(C) For transition elements,the group number is determined by the sum of $(n-1)d$ and $ns$ electrons.Given configuration: $4d^3$ $5s^2$.Number of electrons in $(n-1)d$ orbital = $3$.Number of electrons in $ns$ orbital = $2$.Total electrons = $3 + 2 = 5$.Therefore,the element belongs to group $V$ $B$.