Potassium (K) and Rubidium (Rb) forms
Answer & explanation
Correct answer: option 3
The correct answer is option 3. Superoxides.
Superoxides are compounds that contain the superoxide ion, \(O^{2-}_2\). The superoxide ion is a very reactive species, and it is responsible for the strong oxidizing properties of superoxides.
The chemical formulas for potassium superoxide and rubidium superoxide are \(KO_2\) and \(RbO_2\), respectively.
The other options are incorrect:
- Suboxides are compounds that contain less oxygen than the stoichiometric oxide of the element.
- Peroxides are compounds that contain the peroxide ion, \(O^{2-}_2\).
- Dioxides are compounds that contain two oxygen atoms per metal atom.