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  4. Lanthanides and actinides are also called

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Q. Lanthanides and actinides are also called

MGIMS WardhaMGIMS Wardha 2011

Solution:

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