Verified Solution • 2025–26 Session moderate

QJEEM02Ch581a: JEE Main 2002 Chemistry - Class 11 JEEM02Ch581a Solution: The correct order of ionic radius is

The correct order of ionic radius is

Multiple Choice Options

  • A Ce>Sm>Tb>Lu
  • B Lu>Tb>Sm>Ce
  • C Tb>Lu>Sm>Ce
  • D Sm>Tb>Lu>Ce

Step-by-Step Verified Solution

Those are the elements of lanthanides series.

AIEEE 2002 Chemistry - Periodic Table & Periodicity Question 132 English Explanation
In lanthanide series the extra electron is added in 4f subshell and we know in periodic table from left to right the effective nuclear charge increases as electron is added so the size of elements will decreases.

So, the correct order is Ce>Sm>Tb>Lu.

Related Learning Resources & Exam Preparation

JEE Main PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring