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ChemistrySingle correct+4 / -1Question 59 of 75

JEE Main 2026 · 4 Apr · Shift 2, Chemistry question 59

Pairs of elements with the same number of electrons in their respective 4f orbital are

[Atomic number. Eu-63, Gd-64, Dy-66, Ho-67, 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:

Choose one option
Answer and worked solution

Official answer: D

4f electron counts.

  • A: Eu 4f74f^7, Gd 4f75d14f^75d^1 → both 7 ✓
  • B: Dy 4f104f^{10}, Ho 4f114f^{11} ✗
  • C: Yb 4f144f^{14}, Hf 4f145d24f^{14}5d^2 ✓
  • D: Lu 4f144f^{14}, Tm 4f134f^{13} ✗

A and C.

(D)

Topics:LanthanoidsElectronic configuration
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