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          Chapter 17
      Properties of Atoms
      & The Periodic Table
                  Physical Science
                   Mrs. Morgan
                 http://www.youtube.com/watch?v=qmgE0w6E6ZI&feature=related


   • Atom-smallest particle that an
     element can be divided & still be the
     same substance

         – Atomos-Greek word meaning “indivisible”




http://www.kochanowicz.com/Atoms%20Photos.htm
 http://education.jlab.org/qa/atom_model.html

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  The Atom’s Nucleus & Beyond
   • Protons- + charged
     particles (1+)

   • Neutrons-neutral

   • Quarks-make up P & N

   • e- are negatively
     charged (1-)
 http://www.phys.uu.nl/~thooft/quarks.html

http://www.cartage.org.lb/en/kids/science/Chemistry/Atoms/Atomic%20Stucture.htm
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  Scientist & The Atomic Theory

   • Democritus- Greek
     philosopher who predicted
     the idea of the atom

   • Aristotle-Greek
     philosopher disagreed &
     was the cause of people
     ignoring him for centuries.




 http://www.infinite-energy.com/iemagazine/issue37/mysteries.html
http://chemistry.mtu.edu/~pcharles/SCIHISTORY/01ancients.html

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• John Dalton - British
  chemist/school
  teacher, offered proof
  of atoms.




                         http://www.atrifleofthis.com/almanac/september/today_in_history_september_6.htm


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• SchrÖdinger & Heisenberg - stated e-
  do not travel in definite paths but
  rather in e- clouds.

  – e- clouds - regions inside an atom where e- are likely
    to be found




                             http://www.windows.ucar.edu/tour/link%3D/cool_stuff/electron_cloud.html

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Identifying the Atom

• Atomic Number - # of P




 http://education.jlab.org/glossary/atomicnumber.html

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• Mass # - sum of P & N

• Atomic mass - the average of the masses of the
  naturally occurring isotopes

      – Atomic mass unit (amu) -SI unit of atomic particles




http://imagine.gsfc.nasa.gov/docs/science/try_l1/cosmic_rays.html

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 • Isotopes - atoms that have same # of P but
   different amount of N.
         – Unstable atom - atom whose nucleus can change it
           composition
         – Radioactive - result of unstable atoms




http://www.bcpl.net/~kdrews/introterms/intro4.html

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A Repeating Pattern

• Periodic = “repeated in a pattern.”

• Periodic Table - elements arranged by ↑ atomic # & by
  changes in physical & chemical properties.




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• Dmitri Mendeleev -
  Russian chemist,
  arranged elements by
  atomic masses




                                              http://www.chem.uiuc.edu/rogers/Text5/Tx56/tx56.html

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Changing the Arrangement
• Henry Moseley -
  (1914) British
  scientist, determined
  the # of P (atomic #)




                    http://www.salem.k12.va.us/staff/sjones/chemweb/atomstru/atparts.htm

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Group- each column of elements from
TOP to BOTTOM




    http://www.cartage.org.lb/en/kids/science/Chemistry/Elements/Periodic%20Table.htm



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Period - each horizontal row of elements
from LEFT to RIGHT




http://www.cartage.org.lb/en/kids/science/Chemistry/Elements/Periodic%20Table.htm


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Regions of the Periodic
Table




http://web.buddyproject.org/web017/web017/metals.html

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