Objective identify the three subatomic particles and compare their properties.

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					  Objective: identify the three
subatomic particles and compare
       their properties.
                 DO NOW
   List all the information you know
    about the subatomic particles.
      The Structure of an Atom
• The beams seen in Thomson’s experiment
  are similar to the ones that are used to
  create color television.

• There are 3 beams, one for each primary
  color and the beams are made from
  subatomic particles (red, green, and blue)-
  swinging ball demo)
 Properties of Subatomic Particles
• Protons
   – + charged
   – Found in the nucleus
   – half the atoms mass
• Neutrons
   – No charge
   – Found in the nucleus
   – half the atoms mass
• Electrons
   – - charged
   – outside the nucleus
   – Are so small their mass does not affect the mass of the atom
  Comparing Subatomic Particles
• Can be distinguished by charge, location, and
  mass in an atom
• Protons and neutrons have almost identical
  masses, but takes about 2000 electrons to
  equal the mass of 1 proton or neutron
• Protons and electrons have equal and
  opposite charges
• Protons and neutrons are found in the nucleus
• Electrons are found in the space outside the
  nucleus
Atomic Number and Mass Number
• Each elements has a unique # of protons
• Atomic Number
  – Protons and electrons
• Mass Number
  – protons + neutrons

  If you know the atomic number and the mass
     number you can figure out the number of neutrons
                    Isotopes
• Atoms of the same element that have different
  numbers of neutrons and different mass
  numbers

• Every atom of Oxygen has 8 protons so the
  atomic number stays the same. Atoms of Oxygen
  can have 8, 9, or 10 neutrons.

• These isotopes are identified by their mass
  number
• Oxygen-16
• Oxygen-17
• Objective: identify the three subatomic
  particles and compare their properties

• Homework: page 112 questions 1-9

				
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posted:1/23/2014
language:English
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