The outer electron configuration of $Gd$ (Atomic No.: $64$) is:

Magnetic moment of $Gd^{3+}$ ion $(Z = 64)$ is .......... $B.M.$

For the first row transition metals,the $E^{\Theta }$ values are:

$E^{\Theta }$	$V$	$Cr$	$Mn$	$Fe$	$Co$	$Ni$	$Cu$
$(M^{2+}/M)$	$-1.18$	$-0.91$	$-1.18$	$-0.44$	$-0.28$	$-0.25$	$+0.35$

Explain the irregularity in the above values.

Maximum oxidation state is shown by

Determine whether the following statements are True $(T)$ or False $(F)$:
$(a)$ Transition elements contain $d$-orbitals.
$(b)$ Ions of transition elements contain incompletely filled $d$-orbitals.
$(c)$ Only elements with completely filled $3d$ orbitals are considered transition elements.
$(d)$ Only elements that have incompletely filled $d$-orbitals in their ground state as well as in their ions are called transition elements.

In the first transition series,the highest $B.P.$ and $M.P.$ is of