To identify which diagram represents a compound, you typically look for a representation that shows two or more different elements chemically bonded together in a fixed ratio. This could be depicted as:
- A chemical formula (like H₂O for water, or CO₂ for carbon dioxide) indicating the type and number of atoms.
- A structural diagram showing atoms connected by lines (bonds), where different atoms (for example, oxygen and hydrogen) are shown joined together.
If you have specific diagram options, you can describe them, and I can help you determine which one represents a compound.