Chemistry - f-block Question with Solution | TestHub

In case of lanthenides with the increase of atomic number atomic and ionic size decrease constantly but slightly due to poor screening effect by inner electrons.
$\underset{103\mathrm{p}\mathrm{m}}{\mathrm{L}{\mathrm{a}}^{3+}}>\underset{102\mathrm{p}\mathrm{m}}{\mathrm{C}{\mathrm{e}}^{3+}}>\underset{97\mathrm{p}\mathrm{m}}{\mathrm{P}{\mathrm{m}}^{3+}}>\underset{86.8\mathrm{p}\mathrm{m}}{\mathrm{Y}{\mathrm{b}}^{3+}}$