The number of $f$ electrons in the ground state electronic configuration of $Np$ $(Z=93)$ is ....... .

The electronic configuration of $Yb^{2+}$ is:

In $+2$ oxidation state,which of the following lanthanoids act as reducing agents?

The $f$ orbitals are half-filled and completely filled,respectively,in which of the following lanthanide ions?
(Given: Atomic numbers: $Eu=63, Sm=62, Tm=69, Tb=65, Yb=70, Dy=66$)

Identify the correct statements from the following.
$(i)$ $Eu^{2+}$ and $Yb^{2+}$ are reducing agents.
$(ii)$ The electronic configuration of $Pr^{3+}$ is $[Xe] 4f^3$.
$(iii)$ Aqueous solution of $LaCl_3$ is colourless.

Assertion : Magnetic moment values of actinides are lesser than the theoretically predicted values.
Reason : Actinide elements are strongly paramagnetic.