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NEET 2005
Exam
NEET
Year
2005
Subject
Chemistry
Chapter
d and f Block Elements

NEET 2005 · Chemistry · d and f Block Elements

The main reason for larger number of oxidation states exhibited by...

The main reason for larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids is:

Options

  1. Amore energy difference between 5f5 f and 6d6 d orbitals than between 4f4 f and 5 d5 \mathrm{~d} orbitals
  2. Blesser energy difference between 5f5 \mathrm{f} and 6 d6 \mathrm{~d} orbitals than between 4f4 f and 5 d5 \mathrm{~d} orbitals
  3. Clarger atomic size of actinoids than the lanthanoids
  4. Dgreater reactive nature of the actinoids than the lanthanoids

Correct answer

B. lesser energy difference between 5f5 \mathrm{f} and 6 d6 \mathrm{~d} orbitals than between 4f4 f and 5 d5 \mathrm{~d} orbitals

Step-by-step solution

In actinides, both 4f4 f and 5f5 f orbitals are present. These orbitals poorly shields the nuclear charge due to which the energy difference between the 5f5 f and the 6d6 d orbitals will be very low due to which the actinides will show a large number of oxidation states. Caution The elements in which the extra electron enters 5 - orbitals of (n−2)th (n-2)^{\text{th }} shell (5f-block elements, actinides) shows the maximum oxidation state i.e. +7.
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