chapter 4 structure of the atom (people)
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13 terms
Terms | Definitions |
|---|---|
 Democritos | matter is made of small indestructible units called atom, no data to back this up |
| Aristotle | matter is continuous (no smallest particle of matter) |
| John Dalton | stated that all matter consists of tiny particles |
| John Dalton | stated that atoms are indestructible and unchangeable |
| John Dalton | stated that elements are characterized by the mass of their atoms |
| J.J. Thomson | stated that electrons have negative charge |
| J.J. Thomson | created the plumbing model |
| plumbing model | showed matter containing evenly distributed positive charge with electrons distributed out |
| Rutherford | gold foil experiment |
| gold foil experiment | alpha particles were aimed at gold foil, zinc sulfide around gold flashed when alpha particle hit |
| Rutherford | discovered plum pudding model incorrect |
| Chadwick | discovered the neutron |
| Henry Moseley | discovered that the number of protons could define that element |
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