The Lanthanoids

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

The position of inner transition elements is

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

Lanthanide contraction is caused due to:

The general oxidation state of Lanthanoids is _____.

The general electronic configuration of lanthanoids is $\left[\mathrm{Xe}\right]4{\mathrm{f}}^{1-14} 5{\mathrm{d}}^{0-1} 6{\mathrm{s}}^2$

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

The most common oxidation state of lanthanoids is

The general oxidation state of Lanthanoid series is

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 oxidation state of lanthanoid and actinoid.

Explain the position of lanthanoids.

Give a reason why $\mathrm{Zr}\left(40\right) \& \mathrm{Hf}\left(72\right)$ have almost the same atomic radius.

Explain: The atomic radii of $5\mathrm{d}$ transition elements are very similar to $4\mathrm{d}$ transition elements.

What is mischmetal? Write its one use.

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

Write general electronic configuration of inner transition elements.