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MHT CET20225 Aug 2022Morning ShiftChemistryd and f Block ElementsActual

Which from following pair of elements have one electron in 5d-subshell in observed electronic configuration?

Options

  1. ASm (Z=61) and Eu (Z=63)
  2. BLu ( Z =7) and Dy ( Z =71)
  3. CGd (Z=64) and Lu ( Z =71)
  4. DCe ( Z =58) and Nd ( Z =60)

Correct answer

C. Gd (Z=64) and Lu ( Z =71)

Step-by-step solution

aligned & Ce (58)=[ Xe ] 4 f ^1 5 ~d ^1 6 ~s ^2 & Nd (60)=[ Xe ] 4 f ^4 6 ~s ^2 & Sm (62)=[ Xe ] 4 f ^6 6 ~s ^2 & Eu (63)=[ Xe ] 4 f ^7 6 ~s ^2 & Dy (66)=[ Xe ] 4 f ¹⁰ 6 ~s ^2 & Gd (64)=[ Xe ] 4 f ^7 5 ~d ^1 6 ~s ^2 aligned

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