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 most difficult of all electrons to remove.
D)Core electrons are the easiest of all electrons to remove.
E)All of the above are true.

Question

Quizplus · Accepted Answer

Core electrons are closer to the nucleus and thus experience a greater attraction to the positively charged nucleus. As a result, they are more effective at shielding the outer electrons from the nuclear charge. Valence electrons are the easiest to remove because they are the furthest from the nucleus and experience the weakest attraction to the nucleus. Therefore, statement C is false. Statement A is also false because outer electrons do not efficiently shield one another from nuclear charge since their repulsion keeps them apart. Statement D is false because core electrons require more energy to be removed than valence electrons due to their stronger attraction to the nucleus. Therefore, the correct statement is B.

Choose the Statement That Is True