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Flashcards in Chapter 4 Deck (8)
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First person to propose the idea that matter was not infinitely divisible, but made up of individual particles called atoms

Democritus

1

Disagreed with Democritus because he didn't believe empty space could exist

Aristotle

2

Theory that easily explained conservation of mass in a reaction as the result of the combination, separation, or rearrangement of atoms

Daltons atomic theory

3

Cathode Rays are a stream of particles carrying a ___ charge

Negative

4

Measured the affects of both magnetic and electric fields on the cathode ray to determine the charge to mass ratio of a charged particle, then compared it to known values

JJ Thomson

5

Used oil drop apparatus to determine the charge of an electron

Robert Millikan

6

Studied how positively charged alpha particles interacted with solid matter, gold foil

Ernest Rutherford

7

Atoms with the same number of protons but diff neutrons

Isotope