General Properties of Lanthanoids

The oxidation state which is common for all lanthanoids is _____.

Which of the following represents the incorrect order of property mentioned?

Write the general properties of lanthanoids.

Which of the following oxidation states is common for all lanthanoid?

Which of the two have an almost similar size?

Lanthanide contraction is caused due to:

The general oxidation state of Lanthanoids is _____.

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

Lanthanoid contraction is the gradual decrease in the atomic and ionic size of Lanthanoids with a decrease in atomic number.

Lanthanoid contraction is the gradual decrease in the atomic and ionic size of Lanthanoids with a decrease in atomic number.

In $\mathrm{d}$-Block when atomic size of one series are compared with those of corresponding element in other series :-
(I) Increase from the first $\left(3\mathrm{d}\right)$ to second $\left(4\mathrm{d}\right)$ series
(II) Increase from the second $\left(4\mathrm{d}\right)$ to third $\left(5\mathrm{d}\right)$ series
(III) Virtually the same as first $\left(3\mathrm{d}\right)$ and in second $\left(4\mathrm{d}\right)$ series
(IV) Virtually the same as second $\left(4\mathrm{d}\right)$ and in third $\left(5\mathrm{d}\right)$ series

The most common oxidation state of lanthanoids is

The general oxidation state of Lanthanoid series is

Give explanation

 Europium$\left(\mathrm{II}\right)$ is more stable than cerium$\left(\mathrm{II}\right)$

Which of the following oxidation state is common for all lanthanoids?

The pair that has similar atomic radii is:

Why ${\mathrm{Gd}}^{3+}$ is colourless?

Which of the following lanthanoids show $+2$ oxidation state besides the characteristic oxidation state $+3$ of lanthanoids?

Explain, the trends in atomic and ionic sizes of lanthanoids and also of first row elements of transition series.

Why do lanthanoid form coloured compound?