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Modern Atomic Theory
Transcript of Modern Atomic Theory
De Broglie (1923) discovered electrons have a dual nature - act similar to particles and waves
Schrödinger (1930) electrons are continuous clouds; confirmed Bohr's model of the atom
Chadwick (1931) discovered the neutron - solved problem of the mass of protons not equalling the mass of electrons. Electron Cloud Model Greek atomic theory: Democritus 442 BC
Matter composed of tiny atoms that can't be divided into smaller particles
Aristotle revised the model and said no piece of matter could be so small that it couldn't be cut again into a smaller piece; matter made up elements: fire, air, earth & water
Greek theory accepted for next 2000 years John Dalton (1808) - "Billiard Ball Model"
atom - tiny, indivisible, indestructible particle
atoms of different elements have different masses
atoms have uniform density and constitution (like a billiard ball) J. J. Thompson (1903) Nuclear Planetary Model nucleaus - small core of atom where mass & positive charge located
negative electrons orbit randomly around the nucleus Greek Atomic Model
442 BC - 1800s http://www1.union.edu/newmanj/Physics100/Light%20Production/producing_light.htm http://reich-chemistry.wikispaces.com/slattery.atomichistory.2011 http://stkbla.blogspot.com/2010/10/lesson-8-continued-bohrs-model.html http://www.windows2universe.org/cool_stuff/electron_cloud.html http://mail.colonial.net/~hkaiter/atoms_and_elements.htm Neils Bohr (1913) was dissatisfied with current atomic models because they didn't explain how energy was absored or released in the reactions he observed; he discovered electrons were arranged around the nucleus in energy levels Antoine Lavoisier (1777) identified the difference between an element and a compound; established the element as a simple substance that cannot be broken down by any known method of chemical analysis. Robert Millikan (1909) discovered
the electron and its negative electrical
charge In 1897 discovered the atom contains negatively charged electrons; identified electron as component of all matter; chalculated charge to mass ratio of the electron
In 1903 developed the Plum Pudding Model of the Atom
positive material in the atom = pudding
negative electrons scattered throughout the atom = raisins