Which set does not show correct matching ?

Options

A. `Cr = [Ar] 3d^(5)4s^(1)`, element belongs to `6^(th)` group.
B. `Fe^(2+) =[Ar]3d^(6)`, element belongs to `8^(th)` group.
C. `Sc^(3+) = [Ne] 3s^(2)3p^(6)`, element belongs to zer/eighteen group.
D. All of the above

Answer

C

Explanation

(A) `._(21)Sc^(3+), [Ar]^(18) 3d^(0) 4s^(0)` and `._(21)Sc[Ar]^(18)3d^(1)4s^(2)`
As last electron enters in d-subshell so it belongs to d-block and thus its group number `=2 +1 = 3`. Element belong to 3rd group of modern periodic table, not zero group.