| Term | Definition |
|---|
| Proton | a subatomic particle that has a positive charge and that is found in the nucleus of an atom |
| Neutron | a subatomic particle that has no charge and that is found in the nucleus of an atom |
| Electron | negatively charged particle; located outside the atomic nucleus |
| Nucleus | the central core of an atom that contains protons and neutrons |
| Electron cloud | the system of electrons surrounding the nucleus of an atom |
| Matter | The substance that all physical properties are composed of |
| Valence Electron | the electrons that are the farthest away from the nucleus of an atom and involved in chemical reactions |
| Subatomic Particles | particles inside an atom (protons, neutrons, electrons) |
| Chemical Equation | a shorthand way to use chemical symbols and numbers to describe a chemical reaction |
| Law of Conservation of Mass | the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes |
| Mass | Amount of matter in an object |
| Coefficient | the "big" number in front of a chemical formula that shows the number of molecules of a compound |
| Chemical Formula | way of writing the name of a compound using chemical symbols |
| Yield | The arrow in a chemical equation that points to the product |
| Reactant | a chemical substance that is present at the start of a chemical reaction |
| Product | a chemical substance formed as a result of a chemical reaction |
| Subscript | a "small" number written to the right of a chemical symbol in a formula |
| Compound | a substance made up of two or more elements joined by chemical bonds |
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