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How would you account for the following:...

How would you account for the following: There is a greater range of oxidation states among the actinoids than among the lanthanoids.

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Actinoids show a large number of oxidation states. This is because of very small energy gap between 5f, 6d and 7s subshells.
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OMEGA PUBLICATION-THE D- AND F-BLOCK ELEMENTS-MULTIPLE CHOICE QUESTIONS
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  12. Transition elements

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