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The History of the Atom

Democritus

matter was composed of small particles

These small particles are indivisable

John Dalton

Atomic Theory:

made up of very small particles

all atoms are indivisable

William Crookes

Cathode rays travel in straight lines.

Cathode rays cause glass to fluorese when they strike it

Posess enough energy to move a paddle wheel

Passed electric current through vacuum tube of air at low pressure