Here's why:
* Definition of a Compound: A compound is a substance formed when two or more different elements are chemically bonded together in a fixed ratio.
* Examples of Compounds with Different Elements: Water (H₂O), carbon dioxide (CO₂), sodium chloride (NaCl)
* Examples of Compounds with the Same Element: Ozone (O₃), Oxygen (O₂), Sulfur (S₈)
Key Point: While many compounds are formed from different elements, some compounds are made up of the same element but in different arrangements or bonding structures. These are called allotropes.
Therefore, the defining characteristic of a compound is the chemical bonding of elements, not necessarily the presence of different elements.
