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Name a member of the lanthanoid series w...

Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state.

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Cerium is known to exhibit `+4` state. Example of `Ce^(4+)` in compounds is `CeF_(4)`, or `Ce(SO_(4))_(2)`. This is because `Ce^(4+)` has inert gas electronic configuration.
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