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Cathocle Ray Tube
CRT
Crookes Tube |
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Discovered the e- (electron) particle
1/2000 times the mass of an H atom |
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| Discovered the "nucleus" and protons |
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Discovered the neutron
The nucleus had to have another particle to stop the protons from repelling |
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| Proposed that e- must move along fixed paths called orbits withe the e- cloud |
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| The atoms with the same number of protons but different numbers of neutrons |
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| The number that represents the sum of the number of protons and neutrons in the nucleus |
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