Place the following ions in order from smallest to largest ionic radii: K⁺,Na⁺,Mg²⁺,and Al³⁺. A) Al³⁺

Question

Place the following ions in order from smallest to largest ionic radii: K⁺,Na⁺,Mg²⁺,and Al³⁺. A) Al³⁺ < Mg²⁺ < Na⁺ < K⁺ B) Na⁺ < Mg²⁺ < Al³⁺ < K⁺ C) K⁺ < Mg²⁺ < Na⁺ < Al³⁺ D) K⁺ < Al³⁺ < Mg²⁺ < Na⁺ E) Mg²⁺ < Al³⁺ < Na⁺ < K⁺

Quizplus · Accepted Answer

Ionic radii decrease across a period due to increasing nuclear charge which pulls electrons closer, and increase down a group due to added electron shells. Thus, Al^3+ < Mg^2+ < Na^+ < K^+ reflects this trend correctly.

Place the Following Ions in Order from Smallest to Largest