Electronic Configuration of the Inner Transition Elements

In $\mathrm{f}$-block elements, $\_\_\_$orbitals are progressively filled by the electrons

Gadolinium (atomic number $64$) is a member of $4\mathrm{f}$ series. Its electronic configural in $+3$ oxidation state is $\left[\mathrm{Xe}\right]4{\mathrm{f}}^7.$ What is the ground state electronic configuration of Gadolinium$\_\_\_\_\_\_\_\_\_\_\_$

Among the lanthanide $\mathrm{Eu}, \mathrm{Tb}, \mathrm{Er}$ and $\mathrm{Dy}$, which one readily forms stable divalent ions?

What will be the number of unpaired electrons in $\mathrm{Gd} (\mathrm{Z}=64)$?

Write general electronic configuration of inner transition elements.

The observed electronic configuration of Protactinium (Atomic number $=91$ ) is_______. $\left[\mathrm{Rn}\right]5{\mathrm{f}}^{\mathrm{x}}6{\mathrm{d}}^{\mathrm{y}}7{\mathrm{s}}^{\mathrm{z}}$
The value of $(x+y+z)$ is _______.

The number of f-electrons in ${\mathrm{Ho}}^{2+}$ ion is ______.
$\text{ [At. no. of Ho }=67]$

Choose the stable oxidation states of cerium ($\mathrm{Ce}$).

The atomic number of cerium $\left(Ce\right)$ is 58. The correct electronic configuration of $C{e}^{3+}$ ion is

Choose the incorrect statement among the following.

Electronic configuration of Gd (64) is written as

An element of 5f-series but has no electrons filled in 5f-sub shell

The elements with atomic numbers 57 to 71 are called

The electronic configuration of actinoids cannot be assigned with degree of certainty because of

Which of the following has got incompletely filled $f$-subshell?

The outer electronic configuration of $\mathrm{Gd}$ $(\text{Atomic number}=64)$ is -

Select the correct statements from the following.

The outer electronic configuration of Gd (Atomic No: 64) is