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JEE Main · 2019 · 09 Apr 2019 · Shift 2 · d and f Block Elements

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The maximum number of possible oxidation states of actinoids are shown by
  1. (A)berkelium (Bk) and californium (Cf)
  2. (B)nobelium (No) and lawrencium (Lr)
  3. (C)actinium (Ac) and thorium (Th)
  4. (D)neptunium (Np) and plutonium (Pu)✓ Correct

Answer: (D)

Solution

The actinoids show their widest range of oxidation states near the middle of the series, where the , and electrons lie close together in energy and are all available for bonding. Neptunium and plutonium sit in that region and display states from right up to , the largest spread found among the actinoids.

JEE Main · 2019 · 09 Apr 2019 · Shift 2 · Single correct option

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