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  4. The group of elements in which the differentiating electrons enters in the antipenultimate shell of atoms are called

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Q. The group of elements in which the differentiating electrons enters in the antipenultimate shell of atoms are called

J & K CETJ & K CET 2007Classification of Elements and Periodicity in Properties

Solution:

The group of elements in which the differentiating electrons enters in the antipenultimate (inner to the penultimate shell, ie, $ n-2 $ ) shell are called $ f- $ block elements or inner-transition elements.