1.

Which set does not show correct matching according to Modern periodic table :

Answer»

`CR=[Ar]3D^(5)4s^(1),` elementbelongs to `6^(th)` group.
`Fe^(2+)=[Ar]3d^(6),` element belongs to `8^(th)` group.
`Sc^(3+)=[N e]3s^(2)3p^(6),` element belongs to zero `//` eighteen group.
All of the above.

Solution :`(1)._(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-` subshell and thus the group number `=2+2=3` .
Element belong to `3^(RD)` group of MODERN periodic table, not zero group.


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