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D and F Block Elements question

2005 · Q99
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D and F Block Elements question

2005 · Q99

NEETChemistryD and F Block ElementsMCQ+4 / −1
More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is
  1. A
    more active nature of the actinoids
  2. B
    more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
  3. C
    lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
  4. D
    greater metallic character of the lanthanoids than that of the corresponding actinoids.
View written solutionFree

Correct answer: C

The 5f-orbitals extend into space beyond the 6s and 6p-orbitals and participate in bonding. This is in direct contrast to the lanthanides where the 4f-orbitals are buried deep inside in the atom, totally shielded by outer orbitals and thus unable to take part in bonding.

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