Question

(5):
9. Lanthanide and actinide are resemeble in:
[AFMC-2004]
(1) Electronic configuration
(2) Common oxidation state
(3). Ionization energy
(4) Formation of complex
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Answer 1

Answer:

Lanthanides show variable oxidation states. The most stable oxidation state of Lanthanides is +3. They also show +2 and +4 oxidation states due to the presence of either half-filled or completely filled or empty 4f subshell.

Unlike lanthanides, actinides show a variety of oxidation states from +3 to +6 due to the very small energy gap between 5f, 6d and 7s subshells.  

The principal oxidation states are +3 and +4. The +3 oxidation state is the most stable. The +4 oxidation state is the most stable in Th and Pu. +5 in Pa and Np and +6 is seen in U. In actinides, the distributions of oxidation states are uneven.

Explanation:

option B common oxidation state

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