Scientist of the Atomic Theory
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Created by:
jodieisner on October 12, 2011
Subjects:
science, chemistry, physics, earth science, atomic theory
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10 terms
Terms | Definitions |
|---|---|
 who created the atomic theory | Democritis |
| Democritis | all matter is a single material made of small, hard particles. if you keep dividing something you will eventually reach an uncuttable" particle. the difference between diffetent substances is due the size or shape of the atom |
| "atomos" | undividable |
| John Dalton | he lived in the lat e 1700s. He said all substances are made of atoms, buch each atoms of the same element are identical, and atoms of different elements are different. said atoms cannot be divided, destroyed or created. |
| JJ Thomson | lived in the 1800s. Conducted the cathode ray tube experiment. discovered negatively charged particles called electrons. explained his idea as the plum pudding model. |
| cathode ray tube experiment | a beam was shot throgh a tube. on the top and bottom of the tube he put a negative piece and a positive piece. he shot the ray, but instead of it shooting straight, it lead more towards one side. this proved that there were even smaller particles in an atom. |
| Ernest Rutherford | lived in the late 1800s and early 1900s. determined that the atom is not a hard particle, but really a small dense center called a nucleus, surrounded by empty space, and the electrons were scattered around the empy space. conducted the gold foil experiment. |
| James Chadwick | lived late 1800s to mid 1900s. discovered the eutrons. the neutron keeps the positively charge protons from repelling each other. |
| Niels Bohr | lived in the late 1800s to early 1900s. theorized that electrons were not scattered, but rather traveled in sepcific paths in orbits around the nucleus. his model is still used today altough not considered correct. |
| Schrondinger/Heisenberg | lived in the 1900s. They therorized the current atom structure: theres a small dense nucleus made of protons and neutrons, surrounded by the empty space where the elections are in regions called electron clouds. we can't tell where electrons are, just that they're probably somewher ein hte electron cloud. |
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