Which of the following ions and atoms has the greatest radius? A) Se²¯ B) Br¯ C) Rb⁺ D) Sr²⁺ E) Kr

Name: Which of the following ions and atoms has the greatest radius? A) Se 2 ¯ B) Br¯ C) Rb + D) Sr 2+ E) Kr
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The Se²⁻ ion has the greatest radius because it gains electrons, increasing electron-electron repulsion and expanding the electron cloud, while the other ions and atoms either lose electrons or have a smaller atomic size.

Which of the Following Ions and Atoms Has the Greatest