Question | Answer |
What’s wrong with Dalton’s model? 1.Atoms are divisible 2. made up of protons/neutrons + electrons 3. no electrons | aaaa.
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Elements are composed of tiny indivisible particles called atoms. | .
| Atoms of the same elements are identical | .
| Atoms of different elements are different | .
| Atoms of different elements combine together to create a compound | .
| In a chemical reaction, atoms are rearranged, but not created or destroyed | .
| What’s wrong with Thomson’s model? 1. Doesn't explain neutral atom 2. electrons should be outer 3. missing nucleus in the center | .
| “Plum pudding model”= positively charged spheres atoms with negatively charged electrons scattered throughout | .
| Plum Pudding model (This model was wrong because it’s missing a nucleus in the center) | .
| Cathode Ray Tube (CRT) Experiment = lead to the discovery of the electrons | .
| What’s wrong with Rutherford’s model? 1. electrons do not spiral 2. neutrons 3. energy levels | .
| Rutherford shot | alpha particles ( positively charged) through a thin layer of golf foil.
| Rutherford predicted that the alpha particles would travel | straight through the gold atoms. Most alpha particles did passed straight through the gold foil, however, a few alpha particles were deflected because of a small dense nucleus in the center while most of the atom’s volume is empty space.
| What’s wrong with Bohr’s model? | 1. electrons do not orbit around nucleus like planets
| Bohr’s model: | electrons orbits the nucleus just like how the planets orbit the sun.
| In Bohrs model,Electrons are restricted to certain fixed | energy level. |