| A | B |
|---|
| JJ Thomson | discovered the electron using Crooke’s tube |
| Plum Pudding Model of Atom | atomic model of Thomson described as having negative charges spread out among an equal number of negative charges |
| Ernest Rutherford | bombarded gold foil with alpha particles leading to Nuclear Model of atom |
| Gold Foil Experiment | most alpha particles deflected, few bounce back, atom mostly empty space with a small dense positively charged center |
| Solar System Model of Atom | alternate explanation of nuclear model proposed by Rutherford emphasis on electrons freely orbiting nucleus |
| James Chadwick | discovered the neutron |
| Energy Level Model of Atom | proposed by Neils Bohr modified Nuclear Model by explaining electrons were found on specific energy levels |
| ion | a charged atom that has lost or gained an electron |
