Place the following in order of increasing radius. Br⁻ Na⁺ Rb⁺
A) Br⁻

Question

Place the following in order of increasing radius. Br⁻ Na⁺ Rb⁺
A) Br⁻ < Rb⁺ < Na⁺
B) Na⁺ < Rb⁺ < Br⁻
C) Rb⁺ < Br⁻ < Na⁺
D) Br⁻ < Na⁺ < Rb⁺
E) Rb⁺ < Na⁺ < Br⁻

Quizplus · Accepted Answer

Na⁺ has the smallest radius due to its high effective nuclear charge and loss of an electron shell. Rb⁺ is larger than Na⁺ because it has more electron shells. Br⁻ is the largest due to gaining an electron, which increases electron-electron repulsion and expands the electron cloud.

Place the Following in Order of Increasing Radius