Screening by core electrons in atoms is .
A) essentially identical to that by valence electrons
B) less efficient than that by valence electrons
C) more efficient than that by valence electrons
D) responsible for a general decrease in atomic radius going down a group
E) both essentially identical to that by valence electrons and responsible for a general decrease in atomic radius going down a group

Question

Quizplus · Accepted Answer

Core electrons are closer to the nucleus and more effectively shield the nuclear charge from the valence electrons compared to the valence electrons themselves.

Screening by Core Electrons in Atoms Is