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Elements
| Question | Answer |
|---|---|
| an organized list of all known elements | periodic table |
| negatively charged subatomic particles | electrons |
| the number of porotons and nuetrons in an atom's nuecleus | mass number |
| an atom of the same element that has different numbers of nuetrons | isotope |
| nuetrally charged subatomic partices | nuetrons |
| the positively charged center of an atom |