The electronic configuration of $Gd^{2+}$ is (at. no. of $Gd$ is $64$)

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.

Gadolinium has a low value of third ionisation enthalpy because of $......$

The number of unpaired electrons in $Cr^{3+}$ ion is

Which among the following elements is a soft element as compared to others?

The electronic configuration of a metal element is given below:
$M = 1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^1$
To which block does this element belong?