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Matter made up of tiny indivisible particles.
No one agreed, what held them together.
Theory came back in 17th and 18th centuries. |
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Objects have either positive of negative charge.
Like repel, opposites attract. |
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Law of Conservation of Mass
During chemical reactions substance does not lose or gain mass. |
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Law of Constant Composition
Compound always contains the same element in the same proportion by mass. |
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Four main ideas (see paper)
Based of Democritus' experimental work.
Atomic model: atoms were small indivisible, indestructable particles. each had a certain mass, size, chemical behavior according to the element. |
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Electrolysis experiment.
Atoms contain particles which contain electrical charge. |
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Cathode Rays/tubes
Found the electron.
atoms looked like raisin bread.
Ratio electron's electrical charge to its mass. |
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| Henri Becquerel & Marie Curie |
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B: observed uranium displays radioactivity.
C: isolated radium and polonium (found same thing)
Phenomenon was called radiation phenomena. |
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Geiger-Marsden experiment
Radioactive sample in front of 2 electrically charged plates. the ones taht went to the negative plate are alpha radiation. Positive plats are beta radiation. alpha and beta radiation are made up of particles. Alpha= 2x charge than electron
Beta= high-speed particles.
Atom much more complex than previous structures. |
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Oil Drop Experiment
Electron is extremely light.
2000x lighter than hydrogen |
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