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ISOTOPES OF BEADIUM LAB

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					S. Erwin - IPC - TEK 7E
                        ISOTOPES OF BEADIUM LAB

        Atoms are made of protons, neutrons, and electrons. The number of protons in
the nucleus of the atom identifies the atom. The mass of the atom is determined by
adding the number of protons to the number of neutrons. While all atoms of the same
element have the same number of protons, not all atoms of the same element have the
same number of neutrons. Atoms of the same element with different numbers of
neutrons are called isotopes. For example, there are three isotopes of hydrogen. The
most common isotope of hydrogen (called Protium) has one proton and no neutrons. A
less common isotope of hydrogen (called Duterium) has one proton and one neutron.
The rarest isotope of hydrogen (called Tritium) has one proton and two neutrons. Since
not all atoms of the same element have the same number of neutrons, they do not have
the same atomic mass.

        In this lab you will determine the mass number of the elements Redium,
Yellowium, Bluium, and Greenium. Each bag represents the nucleus of a single atom of
that element. Within each bag are two kinds of beads: transparent beads and opaque
beads. The transparent beads represent the protons and the opaque beads are neutrons.

                             DO NOT OPEN THE BAGS!

PROCEDURE

   1. Select a baggie.
   2. Without opening the bag count the number of protons in the bag. Record this
       value in the data table.
   3. Without opening the bag count the number of neutrons in the bag. Record this
       value in the data table.
   4. Calculate the atomic mass number of the atom. Record this value in the data
       table.
   5. Return the baggie and select a baggie of the same color with a different number.
   6. Without opening the bag count the number of protons in the bag. Record this
       value in the data table.
   7. Without opening the bag count the number of neutrons in the bag. Record this
       value.
   8. Calculate the atomic mass number of the atom and record the value in the data
       table..
   9. Repeat steps 1-8 until you have determined the atomic mass each of the four
       atoms (baggies) for the element color your group selected.
   10. Add the masses for each of the four atoms (baggies) and divide by four to
       determine the average mass of your element.
   11. Repeat steps 1-10 for each of the elements (colors).
S. Erwin - IPC - TEK 7E
                 ISOTOPES OF BEADIUM DATA TABLE

 Color          Bag #       # protons     # neutrons       mass #       average mass
  Red             1
                  2
                  3
                  4
  Blue            1
                  2
                  3
                  4
 Green            1
                  2
                  3
                  4
 Yellow           1
                  2
                  3
                  4

Post Lab Questions
   1. How were all "atoms" of the element Yellowium alike?
       same number of protons
   2. How were the "atoms" of the element Yellowium different?
       different number of neutrons
   3. How were all "atoms" of the element Greenium alike?
       same number of protons
   4. How were the "atoms" of the element Greenium different?
       different number of neutrons
   5. What are atoms of the same element with different numbers of neutrons called?
       Isotopes
   6. What is the term for the number of protons in the nucleus of an atom?
       Atomic number
   7. Complete the table below

  Element       Element        Atomic       # of Protons   # Neutrons       Mass #
   Name         Symbol         Number
   Iodine          I             53              53            73            126
   Silver         Ag             47              47            61            108
   Nickel          Ni            28              28            30             58
  Oxygen           O              8               8             7             15
S. Erwin - IPC - TEK 7E
  Potassium         K     19   19   21   40
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