Events
Democritus (Greek Philosopher) 460 BC
*Came up with the term Atom (Atoma)
*Divided paper until it
was no longer possibleIsaac Newton (1704)
*Proposed a mechanical universe
with small solid masses that
continuously moveJohn Dalton (1808)
*Proposed his atomic theory
based upon measurable
properties of mass called
Dalton's Atomic TheoryDalton's Atomic Theory
1) Law of Conservation of Mass
2) Law of Definite Proportions
3) Law of Multiple ProportionsWilliam Crookes (1870)
*Invents Cathode Ray TubesJ.J. Thomson (1897)
*discovered negatively
charged particles called
Electrons using a
Cathode Ray with magnetsCathode Ray tube experiment
*Involved using magnets
-negative side repelled
-positive attractsRobert Millikan (1909)
*Measured the charge of
the electron by doing the
Oil Drop experimentOil Drop Experiment
.
.
.Plum Pudding Model
*First complete
model of an atom
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.
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