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  4. What elements are present in f- block series?

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Q. What elements are present in $ f- $ block series?

J & K CETJ & K CET 2014The d-and f-Block Elements

Solution:

$ f- $ black series is divided into two series
$ ViZ $ $ 4f- $ series and $ 5f- $ series.
The members of $4f$ series are called lanthanides or lanthanons
whereas that of $ 5f- $ series are called actinides or actinons.