The d-And-f-Block Elements

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Why are the 4f and 5f inner transition metals called lanthanoids and actinoids, respectively?

The lanthanum closely resembles the lanthanoids and is included in all its properties. Hence, the series is named after the nature of the metal as lanthanoids. Similarly, the nature has been given to 5f series metals as actinoids.
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    What is so special about Pr, Nd, Tb and Dy lanthanoids?
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    Give the general electronic configurations of lanthanoids and actinoids.

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    Which is the most common oxidation state of lanthanoids?
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    Which is the hardest lanthanoid? Give reason.
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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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    Which lanthanoid has maximum paramagnetism?
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    Why does the hardness of lanthanoids increase along the series?
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    What is the common symbol used for lanthanoids.
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