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

 3203  197 J & K CETJ & K CET 2007Classification of Elements and Periodicity in Properties Report Error

Solution:

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