An electron in the outermost shell of a(n) _____ atom would experience the most amount of shielding.
A) chlorine
B) fluorine
C) iodine
D) hydrogen
E) astatine

Question

Quizplus · Accepted Answer

Astatine, being the heaviest and lowest element listed, has the most electron shells. This results in the outermost electron experiencing the most shielding from the nucleus due to the inner electrons.

An Electron in the Outermost Shell of A(n) _____ Atom