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Scientists
Chemistry
| Scientist | Observation / Discovery |
|---|---|
| Henri Becquerel | Radioactivity |
| James Rutherford | Nucleus small, dense, positive |
| JJ Thompson | Plum pudding model |
| John Newlands | Periodic table Increasing rel. atomic mass in Law of Octaves |
| Dimitri Mendeleev | Periodic table Order of increasing atomic mass Left gaps No noble gases |
| Henry Moseley | Periodic Table Atomic no. Tellerium before Iodine |
| Bohr | Existence of energy levels |