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chapter 17
| Term | Definition |
|---|---|
| 1. atom | which is the smallest piece of matter that still retains the property of the element. |
| 2. atomic number | number of protons in an atom's nucleus. |
| 3. average atomic mass | weighted-average mass of the mixture of an element's isotopes. |
| 4. eletron | particles surrounding the center of an atom that have a charge of 1-. |
| 5. electron cloud | area around the nucleus of an atom where the atom's electrons are most likely to be found. |
| 6. electron dot diagram | uses the symbol for the element and dots representing the number of electrons in the element's outer energy level. |
| 7. group | vertical column in the periodic table. |
| 8. isotope | atoms of the same element tat have different numbers of neutrons. |
| 9. mass number | sum of the number of protons and neutrons in an atom's nucleus. |
| 10. neutron | neutral particle, composed of quarks, inside the nucleus of an atom. |
| 11. nucleus | positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud. |
| 12. period | horizontal row in the periodic table. |
| 13. periodic table | organized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties. |
| 14. proton | particle, composed of quarks, inside the nucleus of an atom that has a charge of 1+. |
| 15. quark | particles of matter that make up protons and neutrons. |
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haileypeck12
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