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Atoms, Molecules, and Matter

Atoms, Molecules, and Matter Democritus ~ 450 B.C. – argued that by cutting up a piece of matter with sharpest knife imaginable, would eventually come to a piece that would not be cut any further: Atom = (Greek word – indivisible) Idea rejected by Plato and Aristotle – matter is continuous.

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Atoms, Molecules, and Matter

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  1. Atoms, Molecules, and Matter Democritus ~ 450 B.C. – argued that by cutting up a piece of matter with sharpest knife imaginable, would eventually come to a piece that would not be cut any further: Atom = (Greek word – indivisible) Idea rejected by Plato and Aristotle – matter is continuous. Due to their influence, Democritus Theory was left dormant for 20 centuries.

  2. Pierre Gassendi (1592-1655) Italian supported by Newton 1600’s: suggests the existence of atoms John Dalton (1776-1844) English chemist and school teacher Developed several laws of chemistry using atomic theory Atoms join to form molecules

  3. Robert Brown (1773-1858) Scottish botanist 1827: looked at pollen grains (suspended in water) under microscope – Browian Motion Explained by Einstein (collision and momentum problem) Dmitri Mendeleev (1834-1907) Period table (only 63 elements) Period = rows Groups = columns (elements that had similar properties = families)

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