In actinides, both 4f and 5f orbitals are present. These orbitals poorly shields the nuclear charge due to which the energy difference between the 5f and the 6d 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 shell (5f-block elements, actinides) shows the maximum oxidation state i.e. +7.
The main reason for larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids is:
NEET UG 2005 — Chemistry Inorganic Chemistry
2005mcqeasy
The main reason for larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids is:
Official previous-year question
Held on 30 Apr 2005 · Verified 9 Jul 2026.
Options
- A
more energy difference between 5f and 6d orbitals than between 4f and 5 d orbitals
- B
lesser energy difference between 5f and 6 d orbitals than between 4f and 5 d orbitals
- C
larger atomic size of actinoids than the lanthanoids
- D
greater reactive nature of the actinoids than the lanthanoids
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