Which one of the following is the correct ord | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

$(A)$ In the $4f$-series, as the atomic number increases from $La$ to $Lu$, the atomic and ionic radii decrease gradually.This decrease in atomic and

Vedclass · Accepted Answer

$Pr^{3+} > Gd^{3+} > Tm^{3+}$

Vedclass · Answer

$(A)$ In the $4f$-series, as the atomic number increases from $La$ to $Lu$, the atomic and ionic radii decrease gradually.This decrease in atomic and ionic size from lanthanum to lutetium is known as lanthanide contraction.Since the atomic number of $Pr$ $(59)$, $Gd$ $(64)$, and $Tm$ $(69)$ increases in that order, their ionic radii decrease accordingly.Therefore, the correct order of ionic radii is $Pr^{3+} (101 	ext{ pm}) > Gd^{3+} (94 	ext{ pm}) > Tm^{3+} (87 	ext{ pm})$.

Which one of the following is the correct order of ionic radii?

Similar Questions

Which of the following is not an actinide?

The common oxidation state of $f$-block elements is $+3$. The other stable oxidation states of $^{63}Eu$ and $^{65}Tb$ are respectively:

Identify the element having the smallest ionic size in the $+3$ state from the following.

Identify the factor responsible for the greater range of oxidation states in actinoids.

Vedclass Test Series

Exam Paper Generator

Online Exam Module