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MHT CET202016 Oct 2020Morning ShiftChemistryd and f Block ElementsActual

Which among the following lanthanoids, shows only +3 oxidation state?

Options

  1. ATerbium
  2. BGadolinium
  3. CNeodynium
  4. DCerium

Correct answer

B. Gadolinium

Step-by-step solution

(B) Gadolinium [Xe] 4 f ⁷ 5 ~d ¹ 6 ~s ² The extra stability of Gd ³⁺ ion is due to their half-filled f-subshells.

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