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  4. Lanthanides and actinides are also called as

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Q. Lanthanides and actinides are also called as

J & K CETJ & K CET 2007The d-and f-Block Elements

Solution:

Lanthanides and actinides contains partially filled $ f- $ subshell of the antipenultimate (inner to the penultimate shell, ie, $ n-2 $ ) shell, so these are known as $ f- $ block elements or inner-transition elements.