Multiple choice

Which of the following forms a stable superoxide?

  1. Li

  2. Ba

  3. Cs

  4. Na
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cesium (Cs) forms a stable superoxide (CsO₂) due to its large ionic radius, which can stabilize the larger superoxide ion (O₂⁻). Among alkali metals, the stability of superoxides increases down the group - potassium, rubidium, and cesium form superoxides, while lithium forms only the oxide and sodium forms primarily the peroxide. Ba is an alkaline earth metal.

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