Write a reaction with lanthanoids $(Ln)$:

If the ionic radius of $_{57}La^{3+}$ is $1.06 \ \mathring{A}$,then the ionic radius of $_{71}Lu^{3+}$ will be approximately close to which of the following values in $\mathring{A}$?

Identify the lanthanoid that exhibits zero effective magnetic moment in $+3$ state.

$A$ reduction in atomic size with an increase in atomic number is a characteristic of elements of

If $Ln$ represents a lanthanoid element,find the general formula of lanthanoid hydroxide.

The common oxidation state of $f$-block elements is $+3$. The other stable oxidation states of $^{63}Eu$ and $^{65}Tb$ are respectively: