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Scientists and Atomic Theory and Periodic Law
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| A | B |
| Leucippus and Democritus | Early atomists |
| Antoine Lavoisier | Father of Modern Chemistry |
| John Dalton | Atomic Theory |
| J. J. Thompson | Discovered electrons |
| Ernest Rutherford | Discovered protons |
| Sir James Chadwick | Discovered neutrons |
| Niels Bohr | Atomic model explained simplest atoms |
| Henry Moseley | Discovered how to determine atomic number |
| Dmitri Mendeleev | credited with first Periodic Table arranged by atomic mass |
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