Choose the statement that is TRUE.
A) Outer electrons efficiently shield one another from nuclear charge.
B) Core electrons effectively shield outer electrons from nuclear charge.
C) Valence electrons are the most difficult of all electrons to remove.
D) Core electrons are the easiest of all electrons to remove.

Question

Quizplus · Accepted Answer

Core electrons are closer to the nucleus and therefore shield outer electrons more effectively. Valence electrons, on the other hand, are the outermost electrons and are more easily removed than core electrons, making statement C false. Statement A is also false because outer electrons do not efficiently shield one another from nuclear charge. Finally, statement D is false because core electrons are held more tightly to the nucleus and are therefore more difficult to remove than valence electrons.

Choose the Statement That Is TRUE