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What is the order of the scientists?
- Democritus, Dalton, Goldstein, Thomson, Rutherford, Bohr, Millikan, Schrodinger, Chadwick
- DDGTRBMSC
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What is a good way to remember the order of the scientists?
- DDGTRBMSC
- dogs do good things reverently because many squirrels come
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What did John Dalton do?
studied ratios, came up with Daltons atomic theory
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What did Goldstein do?
discovered protons, protons mass = 1/1840 electron's mass
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What did Thomson do?
discovered electrons, Cathode Ray experiment
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What did Rutherford do?
learned most of atom is just empty space, discovered nucleus, Gold Foil experiment
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What did Bohr do?
new model of atom, electrons orbit around nucleus in set rings and ENERGY LEVELS
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What did Millikan do?
- found quantity of charge carried by electrons
- found ratio of charge to mass of electrons
- found mass of electron (1/1840 mass of hydrogen atom)
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What did Schrodinger do?
- used quantum theory (math) to find electron in hydrogen atom aka Quantum Mathematical Model.
- doesn't define exact path of electrons
- electron is found 90% of the time
- "electron cloud"
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What did Chadwick do?
- discovered neutrons
- all subatomic particles were then found
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What does the Law of Definite Composition say?
compounds always have the same elements in the same proportions
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What does the Law of Conservation of Mass say?
Matter cannot be created or destroyed
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What does the Law of Multiple Proportions say?
The same elements can make different compounds of amounts change
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What is another name for the Cathode Ray experiement?
plum pudding
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