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The Atom
| Term | Definition |
|---|---|
| John Dalton | Billiard Ball Model |
| J.J. Thompson | Plum Pudding Model |
| Ernest Rutherford | Planetary Model |
| Niels Bohr | Orbital Model |
| Isotopes | Atoms with the same number of protons but different number of neutrons |
| Nucleus | The central part of an atom |
| Atomic Number | The number of protons in an atom of an element |
| Mass Number | The total number of protons and neutrons in an element |
| Matter | Anything that takes up space and has mass |
| Atom | The smallest part of an element that has the properties of that element |
| Element | A substance made up of only one type of atom |