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atoms and electrons
| Term | Definition |
|---|---|
| matter | Everything that has mass and takes up space |
| atom | the basic unit of a chemical element |
| electron | particle with a charge of negative electricity |
| proton | particle with positive charge |
| neutron | particle with a neutral charge |
| periodic table | large grid that classifies elements into groups and periods by their atomic number |
| element | A chemical element is a substance that cannot be broken down by chemical means. |