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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All matter is made up of tiny indivisible particles that could not be divided into anything smaller (atomos-atoms)
Continuous theory of Matter
A solid body could be divided into smaller and smaller pieces with no end.B.C.
Experiments and research
All matter is composed of very small particles called ATOMS. almost 2000 years later
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)