What kind of oxides are formed by potassium, rubidium and Caesium?

Explanation

To determine the types of oxides formed by potassium (K), rubidium (Rb), and cesium (Cs), we can follow these steps:

### Step 1: Identify the Group of Elements
Potassium, rubidium, and cesium are all alkali metals, which belong to Group 1 of the periodic table.

### Step 2: Understand Oxide Formation
When alkali metals react with oxygen, they form different types of oxides depending on their position in the group.

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