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chem vocab 3

QuestionAnswer
Democritus a Greek philosopher (460-370 B.C.) who was the first to propose that matter was not infinitely divisible
Democritus believed that matter was made up of tiny particles called atoms that could not be destroyed, created, or further divided.
Aristotle a Greek philosopher (384-322 B.C.) who disagreed with Democritus
he did not believe that empty space could exist Aristotle
his views went unchallenged for 2000 years Aristotle
john Dalton English schoolteacher (1766-1844) whose work marks the beginning of the development of modern atomic theory
john Dalton revived and revised Democritus's ideas based on results of scientific research
daltons atomic theory happened in 1803
cathrode ray tube discovered in 1869
cathrode ray tube unknown rays were emitted from the negative electrode in a vacuum tube toward the positive electrode-these rays traveled in a straight line and could be deflected by an electric field
J.J Thomson performed experiments on Cathrode Ray tubes and was able to determine that the rays were in fact made up of tiny, negatively charged particles called electrons, this was discovered in 1897
plum pudding model discovered in 1904
plum pudding model discovered by Thomson
plum pudding model this suggests that negatively charged electrons are embedded in some positive mass of equal and opposite charge
charge of an electron discovered in 1909
charge of electron Robert Millizan determined the charge of a single electron
robert millizan by spraying oil into tiny droplets, covering them with electrons and then suspending the droplets between charged plates, he was able to determine that each electron has the same negative charge
Ruthford foil experiment discovered in 1911
Created by: user-1963442
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