Who first discovered the atom?



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    In the 5th cent. B.C. Greek philosophers Democritus and Leucippus proposed that matter was made up of tiny, indivisible particles.  They called these particles “a-tomos”, or “atoms”.  In about 1803, John Dalton developed the first atomic theory of matter–that the atom was a sphere composed of an electrically charged positive substance mixed with an electrically charged negative substance. 

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