A molecule is a group of two or more atoms that are bonded together by chemical forces. Molecules can consist of the same type of atoms, such as in diatomic molecules like oxygen (O₂) and nitrogen (N₂), or different types of atoms, such as in water (H₂O) and carbon dioxide (CO₂). Molecules can be classified into different categories: 1. **Elementary Molecules**: Formed from atoms of the same element (e.g.
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