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Isotopes and Ions lecture.ppt - Wikispaces

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					Isotopes and Ions

     Science 9
 How do I know the difference
between an Isotope and an Ion?
Look at the info you have on the atom:
                Mass #
                Atomic #
                   p+
                   e-
                    n
                Symbol



    Which one doesn’t match?
            Isotope or Ion?
If the there’s a problem with the number of
   neutrons (too many/too few) it’s an
   ISOPTOPE.



If there’s a problem with the number of
   electrons (too many/too few) it’s an ION.
           Isotope or Ion?
If there are too many or too few neutrons,
   the atom is NOT the average atom. That
   means it is an ISOTOPE.

If the atom has more protons then electrons
   it’s a POSITIVE ION.
If the atoms has more electrons then
   protons it’s a NEGATIVE ION.
   ION/ISOTOPE/ATOM Practice
                       Example 1   Example 2   Example 3   Example 4   Example 5


What is It?
How Do I know?
Neutrons (n)                                               66
Electrons (e-)                     18                                  10
Protons (p+)                                   7
Atomic #                           17                      28
(always = protons)

Mass #                                         16
(protons + neutrons)

Symbol       B
Element Name                                                           Sodium
                              ANSWERS
                       Example 1   Example 2      Example 3   Example 4   Example 5


                       Atom        Negative Ion   Isotope     Isotope     Positive Ion
What is It?
How Do I know?         Average -1                 Heavy       Heavy       +1
                       mass/no charge             Atom        atom        charge
                       charge
Neutrons (n)           6           18             9           66          12
Electrons (e-)         5-          18-            7-          28-         10-
Protons (p+)           5+          17+            7+          28+         11+
Atomic #               5           17             7           28          11
(always = protons)

Mass #                 11          35             16          94          23
(protons + neutrons)


Symbol       B                     Cl             N           Ni          Na
Element Name Boron                 Chlorine       Nitrogen    Nickel      Sodium
       Making Observations:
• Direct vs. Indirect Observation:

For example, if you were interested in
 seeing how much candy was purchased
 by a particular neighborhood, you could
 gather the information in one of the two
 following ways:
         Direct observation:
              Example
Observe customers in a store and count
 how many bags of candy they purchase.
         Indirect observation:
               Example
Look through trash cans on garbage day to
  see how many empty candy bags are in
  each trash bin.
  Direct Observations Defined:
• Direct observations involve looking at the
  actual behavior or occurrence rather than
  a result of that occurrence, which would be
  an indirect observation.
       Indirect Observations:
Indirect observation tends to be used when
  the data cannot be gathered through direct
  means, or when gathering the data
  through direct observation tends to be too
  expensive.

				
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