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Question | Answer |
What’s wrong with Dalton’s model? 1.Atoms are divisible 2. made up of protons/neutrons + electrons 3. no electrons | aaaa. |
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. |