Chemisty, Earth History, Lithosphere, & Infectious dieases
Physical Properties & Changes
Chemical Properties & Changes
Atoms, Elements, Compounds, and Mixtures
Before we move on to the periodic table, I need to make sure you know a few words:
Atoms- The building blocks of all matter. Made of three parts: protons, neutrons, and electrons.
Elements- The most pure substances made of atoms that cannot be chemically broken down any further.
Compounds- Substance formed when two or more elements chemically combine
Mixtures- A combination of two or more substances that are mixed but not combined.