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BITSAT2019Chemistryd and f Block ElementsActual

Which of the following lanthanoid is diamagnetic? Atomic no's Sm = 62 , Ce = 58 , Eu = 63 , Yb = 70

Options

  1. ASm 2 +
  2. BEu 2 +
  3. CYb 2 +
  4. DCe 2 +

Correct answer

C. Yb 2 +

Step-by-step solution

Electronic configuration of the given species are a. Sm 2 + Z = 62 = Xe 4 f 6 b. Eu 2 + Z = 63 = Xe 4 f 7 c. Yb 2 + Z = 70 = Xe 4 f 14 d. Ce 2 + Z = 58 = Xe 4 f 1 5 d 1 On the basis of above electronic configuration, only Yb 2 + Z = 70 has no unpaired electrons i.e. has fully-filled orbitals. Thus, it is diamagnetic in nature.

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