Atoms, Molecules, and Matter

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    09-Feb-2016

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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. - PowerPoint PPT Presentation

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  • Atoms, Molecules, and MatterDemocritus ~ 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.

  • Pierre Gassendi (1592-1655)Italian supported by Newton1600s: suggests the existence of atoms

    John Dalton (1776-1844)English chemist and school teacherDeveloped several laws of chemistry using atomic theory Atoms join to form molecules

  • Robert Brown (1773-1858)Scottish botanist1827: looked at pollen grains (suspended in water) under microscope Browian MotionExplained by Einstein (collision and momentum problem)Dmitri Mendeleev (1834-1907)Period table (only 63 elements)Period = rowsGroups = columns (elements that had similar properties = families)

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