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| Term | Definition |
|---|---|
| Matter | The substance or substances of which any physical object consists or is composed |
| Atom | The smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction; |
| Molecule | The smallest physical unit of an element or compound consisting of one or more like atoms in an element and two or more different atoms in a compound |
| Compound | composed of two or more parts, elements, or ingredients |
| element | A component or constituent of a whole or one of the parts into which a whole may be resolved by analysis |