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6modernatom - Modern Atomic Theory Glenn V Lo Department of...

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    Modern Atomic Theory Glenn V. Lo Department of Physical Sciences Nicholls State University
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    Dalton’s Atomic Theory Postulate 1. Matter is made up of tiny particles  called atoms Postulate 2. Atoms are indestructible. Postulate 3. All atoms of an element are  identical. Postulate 4. Atoms of an element are different  from those of other elements Postulate 5. There are at least two kinds of  atoms in a compound; the relative numbers of  each kind of atom are well-defined
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    Subatomic particles What’s wrong with Dalton’s postulate  that: “Atoms are indestructible”. We now know that atoms are made of  smaller particles: protons, neutrons,  electrons.  Protons and neutrons are  made of even smaller particles called  quarks.  http://pdg.web.cern.ch/pdg/cpep/startstandard.h
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    Mass is not really conserved Since atoms are not indestructible, how do we  now explain the law of conservation of mass? In most phenomena we encounter, protons,  neutrons, and electrons are not destroyed. BUT: we now know that mass is not truly  conserved.  However, the changes are beyond  the sensitivity of typical laboratory equipment  unless the nucleus of the atom is involved  (nuclear change) Nucleus = where protons and neutrons are  located in an atom.
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    Mass & Energy are conserved Law of Conservation of Mass and  Energy Loss in mass is accompanied by release  of energy.  Gain in mass results from 
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