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| Question | Answer |
| An element | a substance that cannot be broken down into simpler substances by a chemical reaction |
| A compound | a substance made by chemically combining two or more elements. |
| The atomic number (Z) | the number of protons in the nucleus |
| Isotopes | atoms of the same element with different mass numbers |
| Cation | A positive ion |
| Anion | A negative ion |
| ion | a charged particle |
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