Identify the incorrect statement in the following.

Which one of the following statements is true for transition elements?

Determine whether the following statements are True $(T)$ or False $(F)$:
$(a)$ The atomic radii of the elements of the second transition series $(4d)$ are larger than those of the first transition series $(3d)$.
$(b)$ $Cr^{+}$,$Mn^{2+}$,and $Fe^{3+}$ have the same electronic configuration.
$(c)$ $Cr^{+}$,$Mn^{2+}$,and $Fe^{3+}$ have the same $d^5$ electronic configuration.

The outer electronic configuration of $Gd \ (At. \ No. \ 64)$ is

The type of orbitals present in $Fe$ is

What is the difference in atomic volume between $Au$ and $Cu$ in $22$ carat gold jewelry?