Final answer:
The statement regarding the formation of cations from main group elements, in which the last added electrons are the first removed, is True. Elements in groups 1 and 2 form cations by losing their valence electrons to achieve a noble gas electronic configuration.
Step-by-step explanation:
In the formation of a cation from the main group elements, the electrons that were added last are indeed the first electrons removed. This statement is True. Main group elements lose their valence electrons to form cations, resulting in a positively charged ion. The alkali metals (Group 1) lose one electron, resulting in a 1+ ion, while the alkaline earth metals (Group 2) lose two electrons to form a 2+ ion. For instance, the removal of one valence electron from a sodium atom forms a Na+ ion while calcium loses two electrons to become Ca2+. Transition elements, however, may lose electrons from an s orbital before the d or f electrons even though those were added earlier.