AP EAMCET202317 May 2023Morning ShiftChemistryd and f Block ElementsActual
Select the correct order of radii of the given ions
Options
- AYb ³⁺ < Sm ³⁺ < Dy ³⁺ < Pr ³⁺
- BYb ³⁺ < Dy ³⁺ < Sm ³⁺ < Pr ³⁺
- CPr ³⁺ < Sm ³⁺ < Dy ³⁺ < Yb ³⁺
- DPr ³⁺ < Sm ³⁺ < Yb ³⁺ < Dy ³⁺
Correct answer
B. Yb ³⁺ < Dy ³⁺ < Sm ³⁺ < Pr ³⁺
Step-by-step solution
The correct order of ionic radii :- aligned & ₇₀ Yb ³⁺ < ₆₆ Dy ³⁺ < ₆₂ Sm ³⁺ < ₅₉ Pr ³⁺ & (86 Pm ) (91) aligned This order can be explained on the basis of lanthanide contraction due to which the atomic and ionic radii decrease steadily.