Atomic Structure—Time line. Ancient Greeks: Democritus and Leucippus All matter is made up of tiny indivisible particles that could not be divided into anything smaller (atomos-atoms) Discontinuous theory. Continuous theory of Matter
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Experiments and research
All atoms of the same element are exactly alike (same mass).
All atoms of different elements are different (different masses).
The joining of 2 or more elements in definite whole number ratios forms compounds.1803—Dalton’s Atomic Theory(combined the above three laws into a theory)