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Chemistry · d and f Block Elements

JEE Main 2026 — 4 April, Evening Shift — Question 56

Pairs of elements with the same number of electrons in their respective 4f orbital are[0pt] [Atomic number, Eu-63, Gd-64, Dy-66, Ho-67,[0pt] Tm-69, Yb-70, Lu-71, Hf-72] A. (Eu and Gd) B. (Dy and Ho) C. ( Yb and Hf ) D. ( Lu and Tm)

Choose the correct answer from the options given below:

  1. Option A:

    B and C Only

  2. Option B:

    A and B Only

  3. Option C:

    A and D Only

  4. Option D:

    A and C Only

    Correct

Answer: D

Step-by-step solution

Gd−[Xe]4f75 d16 s2\mathrm{Gd}-[\mathrm{Xe}] 4 \mathrm{f}^{7} 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{2} Eu−[Xe]4f76 s2\mathrm{Eu}-[\mathrm{Xe}] 4 \mathrm{f}^{7} 6 \mathrm{~s}^{2} Dy −[Xe]4f106 s2-[\mathrm{Xe}] 4 \mathrm{f}^{10} 6 \mathrm{~s}^{2} Ho−[Xe]4f116 s2\mathrm{Ho}-[\mathrm{Xe}] 4 \mathrm{f}^{11} 6 \mathrm{~s}^{2} Hf−[Xe]4f146 s25 d2\mathrm{Hf}-[\mathrm{Xe}] 4 \mathrm{f}^{14} 6 \mathrm{~s}^{2} 5 \mathrm{~d}^{2} Yb−[Xe]4f146 s2\mathrm{Yb}-[\mathrm{Xe}] 4 \mathrm{f}^{14} 6 \mathrm{~s}^{2} Lu−[Xe]4f145 d16 s2\mathrm{Lu}-[\mathrm{Xe}] 4 \mathrm{f}^{14} 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{2} Tm−[Xe]4f136 s2\mathrm{Tm}-[\mathrm{Xe}] 4 \mathrm{f}^{13} 6 \mathrm{~s}^{2}

Answer key and solution verified before publishing.

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Exam
JEE Main 2026
Paper
4 April, Evening Shift
Subject
Chemistry
Chapter
d and f Block Elements
Topic
Inner transition elements (f-Block elements)
Pairs of elements with the same number of electrons in their… | JEE Main 2026 PYQ with Solution · DhiX AI