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Q.
The group of elements in which the differentiating electrons enters in the antepenultimate shell of atoms are called
MGIMS WardhaMGIMS Wardha 2011
Solution:
The group of elements in which the differentiating electron enters in the antepenultimate (inner to the penultimate shell, i.e., $ n-2 $ ) shell are called $ f- $ block elements or inner-transition elements.