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Atoms Mr. Douglas
Unit 12 Atoms Notes
| Question | Answer |
|---|---|
| The smallest part of an element that is still that element | atom |
| They are very small | atoms |
| They do not change in chemical reaction | atoms |
| A positively charged atomic particle | proton |
| A negatively charged atomic particle | electron |
| A neutral atomic particle | neutron |
| Neither positively nor negatively charged | neutral |
| They contain protons, electrons and neutrons | atoms |
| Like electrical charges | repel each other |
| Unlike electrical charges | attract each other |
| The number of protons in each atom of that element | The atomic number of an element |
| The atomic number of an element | the number of protons in each atom of that element |
| It has the same number of protons and electrons | an atom |
| The center of an atom | nucleus |
| A pat that electrons follow around the nucleus | orbit |
| The total number of protons adn neutrons in an atoms nucleus; also called atomic weight | atomic mass |
| These things are in the nucleus of an atom | protons and neutrons |
| These things move in orbits or shells around the nucleus | electrons |
| The number of protons and neutrons in an atom | atomic mass |
| Atomic mass - atomic numbers = | the number of neutrons |
| All of the elctrons orbits or paths | electron shell |
| These are found in shells around the nucleus of an atom | electrons |
| It can only hold a certain number of electrons | an electron shell |
| It has 8 electrons except for the K shell, which has 2 | a complete outer shell |
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