Question

The correct order of ionic radii of Y³⁺, La³⁺, Eu³⁺ and Lu³⁺ is
(a) $La^{3+} \ \textless \ Eu^{3+} \ \textless \ Lu^{3+} \ \textless \ Y^{3+}$
(b) $Y^{3+} \ \textless \ La^{3+} \ \textless \ Eu^{3+} \ \textless \ Lu^{3+}$
(c) $Y^{3+} \ \textless \ Lu^{3+} \ \textless \ Eu^{3+} \ \textless \ La^{3+}$
(d) $Lu^{3+} \ \textless \ Eu^{3+} \ \textless \ La^{3+} \ \textless \ Y^{3+}$
(Atomic nos. Y =39, La = 57, Eu = 63, Lu = 71)

Answer 1

D IS CORRECT ANSWER........

Answer 2

${\huge {\mathfrak {Answer :-}}}$

➡️ Option (D)

That's it..