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JEE Main 202313 AprilMorning Shift

Exam: JEE Main
Year: 2023
Date: 13 April
Shift: Morning Shift
Subject: Chemistry
Chapter: d and f Block Elements

JEE Main 2023 · 13 April · Morning Shift · Chemistry · d and f Block Elements

The pair of lanthanides in which both elements have high...

The pair of lanthanides in which both elements have high third-ionization energy is:

Options

A $Dy, Gd$
B $Lu, Yb$
C $Eu, Yb$
D $Eu, Gd$

Correct answer

C. $Eu, Yb$

Step-by-step solution

Europium has an atomic number of $63$ and a stable electronic configuration of $[ Xe ] 4{f}^{7}6{s}^{2}$ .

Ytterbium, on the other hand, has an atomic number of $70$ and a stable electronic configuration of $[ Xe ] 4{f}^{14}6{s}^{2}$ .

Both have high ${3}^{rd}$ ionisation energy due to half filled & fully filled configuration respectively.

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