Which isoelectronic series is correctly arranged in order of increasing radius? A) Cl^-

Question

Which isoelectronic series is correctly arranged in order of increasing radius? A) Cl^-< Ar < K⁺< Ca²⁺ B) Ca²⁺< Ar < K⁺< Cl^- C) K⁺< Ca²⁺< Ar < Cl^- D) Ca²⁺< K⁺< Cl^-< Ar E) Ca²⁺< K⁺< Ar < Cl^-

Quizplus · Accepted Answer

In an isoelectronic series, the species have the same number of electrons. The radius increases with decreasing nuclear charge. Ca²⁺ has the highest nuclear charge, followed by K⁺, Ar, and Cl⁻, which has the lowest, making E the correct order.

Which Isoelectronic Series Is Correctly Arranged in Order of Increasing