The chemistry of the actinoid elements is not so smooth as that of the lanthanoids. Justify this statement by giving some examples from the oxidation state of these elements.

Explanation

The chemistry of the actinoids is highly complicated unlike the chemistry of the lanthathoids. The chemistry of the lanthanoids is very similar whereas, actinoids differ vastly in their .chemical behaviour, Take, for instance, the oxidation states. Lanthanoids show a remarkably stable oxidation. state of +3, with a few exceptions of +2 and +4, f whereas actinoids show several-oxidation states of not only +3, but +2,+4,+5,+6,+7
Neptunium .(Z=94). shows oxidation states of +3 .+4,+5. and .+7 (etc) . This is due to small energy difference between 5f. 6 d and 7 s subshells of the actinoids.