Introduction to Lanthanoids

Among $\mathrm{Ce}\left(4{\mathrm{f}}^{1}5{\mathrm{d}}^{1}6{\mathrm{s}}^2\right), Nd\left(4{\mathrm{f}}^{1}6{\mathrm{s}}^2\right), \mathrm{Eu}\left(4{\mathrm{f}}^{7}6{\mathrm{s}}^2\right)$ and $\mathrm{Dy}\left(4{\mathrm{f}}^{10}6{\mathrm{s}}^2\right)$, the elements having highest and lowest $3$rd ionisation energies, respectively are

The element with atomic number $61$ belongs to which group?

Which of the following statement is not correct :-

Anti-penultimate electronic configuration of a trivalent lanthanide ion is 4f³ and has similar colour in aqueous solution as another trivalent lanthanide ion having anti-penultimate electronic configuration of

In periodic table, the $15$ elements placed in the $\mathrm{III}$ group and $\mathrm{VI}$ period are called as:

Which of the following ions show colour:

The correct increasing order of ionic radii of the following $C{e}^{3+}, L{a}^{3+}, P{m}^{3+} \mathrm{a}\mathrm{n}\mathrm{d} Y{b}^{3+}$ is

Which statement is incorrect with reference to inner transition elements?

Which one of the following lanthanide ions does not exhibit paramagnetism?

Which one of the following lanthanide ions does not exhibit paramagnetism?

Which one of the following lanthanide ions does not exhibit paramagnetism?

Which of the following elements is a lanthanide (Rare - earth element)?

Which of the following is not an actinoid?

The correct order of atomic radii is:

The size of Nb is very similar to

Lanthanoid contraction is caused due to

A member of Lanthanoids.

The atomic numbers of lanthanoids are from

Rare-earth elements are exhibited by

The correct order of ionic radii of

Y³⁺, La³⁺, Eu³⁺ and Lu³⁺ is: