what is the difference between lanthanoids and actinoids ?

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Solution

Lanthanides Actinides
Maximum oxidation state is +4 oxidation state varies from +3 to +7
Most of them are naturally occurring Most of them are not naturally occurring
Non radioactive (except Promethium) Radioactive
These are the the major differences

Lanthanides	Actinides
Maximum oxidation state is +4	oxidation state varies from +3 to +7
Most of them are naturally occurring	Most of them are not naturally occurring
Non radioactive (except Promethium)	Radioactive

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