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What are the different oxidation states ...

What are the different oxidation states exhibited by the lanthanoids?

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The principal oxidation state of lanthanoids is +3. In addition, they exhibit oxidation states of +2 and +4.
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  15. The trivalent ion having size in lanthanide series is

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  16. Give one example each of lanthanoid ion having +2, +3 and +4 oxidation...

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  18. Why is chemistry of all lanthanoids identical ?

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