The correct order of atomic radii is

Options

A. `Yb^(3+)lt Pm^(3+)lt Ce^(3+)lt La^(3+)`
B. `Ce^(3+)lt Yb^(3+)lt Pm^(3+)lt La^(3+)`
C. `Yb^(3+)lt Pm^(3+)lt La^(3+)lt Ce^(3+)`
D. `Pm^(3+)lt La^(3+)lt Ce^(3+)lt Yb^(3+)`

Answer

A

Explanation

`Yb^(+3)lt Pm^(+3)lt Ce^(+3)lt La^(+3)` due to lanthanide contraction