Which set does not show correct matching ?

Options

A. `Sc^(3+)[Ne]3s^(2)3p^(6)" "`zero group
B. `Fe^(2+)[Ar]3d^(6)" "8^(th)`group
C. `Cr[Ar]3d^(5)4s^(1)" "6^(th)` group
D. All of the above

Answer

1

Explanation

`._(21)Sc^(3+),[Ar]^(18)3d^(@)4s^(@)" 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`. `Sc^(3+)` belong to `3rd` group of `d-` block, not zero group.