The d-And-f-Block Elements

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What is so special about Pr, Nd, Tb and Dy lanthanoids?

Pr, Nd, Tb and Dy lanthanoids along with usual +3 oxidation state also shows +4 oxidation state only in their oxide form as MO2.
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    What is the general electronic configuration of inner transition elements?
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    Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state. 

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    What is the common symbol used for lanthanoids.
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    Which lanthanoid has maximum paramagnetism?
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    Why does the hardness of lanthanoids increase along the series?
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    Which is the hardest lanthanoid? Give reason.
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    Which is the most common oxidation state of lanthanoids?
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    Why are the 4f and 5f inner transition metals called lanthanoids and actinoids, respectively?
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    Give the general electronic configurations of lanthanoids and actinoids.

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