* Monatomic: This term means "one atom."
* Substance: A substance is a material with a definite composition and properties.
Examples of Monatomic Substances:
* Noble Gases: These elements (Helium, Neon, Argon, Krypton, Xenon, Radon) exist naturally as single atoms. They are very stable and don't readily bond with other elements.
* Elemental Metals: While metals are generally found in compounds, they can also exist in their pure, monatomic form. For example, a gold bar is made of only gold atoms.
Important Note:
* Elements are the building blocks of matter. They are made of a single type of atom, but they can exist in different forms (e.g., oxygen gas, O2, is a diatomic molecule, while ozone, O3, is a triatomic molecule).
Let me know if you'd like more examples or have any other questions!
