An electron in the outermost shell of which group 1 element experiences the greatest effective nuclear charge?
A)Sodium, Na
B)Potassium, K
C)Rubidium, Rb
D)all of the above

Question

Quizplus · Accepted Answer

Sodium (Na) has the smallest atomic radius among the given group 1 elements, meaning its outermost electron is closest to the nucleus and experiences the greatest effective nuclear charge due to less shielding by inner electrons compared to Potassium (K) and Rubidium (Rb).

An Electron in the Outermost Shell of Which Group 1