Question

The correct increasing order of ionic radii of the following $Ce^{3+}, La^{3+}, Pm^{3+}$ and $Yb^{3+}$ is

• A. $Yb^{3+} < Pm^{3+} < Ce^{3+} <La^{3+}$
• B. Ce$^{3+}$ < Yb$^{3+}$ < Pm$^{3+}$ < La$^{3+}$
• C. Yb$^{3+}$ < Pm$^{3+}$ < La$^{3+}$ < Ce$^{3+}$
• D. Pm$^{3+}$ < La$^{3+}$ < Ce$^{3+}$ < Yb$^{3+}$

Answer 1

Answer: (A)

$Yb^{3+} < Pm^{3+} < Ce^{3+} <La^{3+}$

Answer 2

The correct option is (A):$Yb^{3+} < Pm^{3+} < Ce^{3+} <La^{3+}$