10/1 What are isotopes?


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10/1 What are isotopes?

  1. 1. Launch:10/1   Grab a your binder and immediately take a seat 5.  The most abundant isotope of lead contains 82 protons and 124 neutrons packed closely together in the nucleus. Why do protons stay together in the nucleus rather than fly apart? a.  Electrons in neighboring atoms neutralize repulsive forces between protons. b.  Neutrons effectively block the protons and keep them far apart to prevent repulsion. c.  Electrostatic forces between neutrons and protons hold the nucleus together. d.  Nuclear forces overcome repulsive forces between protons in the nucleus.   Write a complete sentence about why it is correct!
  2. 2. Unit #3: Nuclear Processes
  3. 3. What are isotopes? Mr. Heffner 10/1/09
  4. 4. What are isotopes?   Isotopes are…   atoms of the same element that have different numbers of neutrons.
  5. 5. Drawing Atoms   # protons = atomic number   # neutrons = atomic mass – atomic number   # electrons = # of protons
  6. 6. Two ways to express? 1.  Element name, hyphen, atomic mass Helium – 4 2.  Element symbol, atomic mass, atomic number Atomic mass 4 Atomic number 2 He
  7. 7. What is the same?   The number of protons = atomic number   The number of electrons
  8. 8. What is the different?   The number of neutrons   The atomic mass
  9. 9. Isotope Activity   Groups of 4   Do not eat the skittles!   One person will build the isotope, while the others watch and give feedback   Then, all students will draw on their own paper   Finally, students will be asked to express the isotope in an alternative way
  10. 10. Exit Slip 1.  An isotope is a a.  an atom of an element with the same number of neutrons but different numbers of protons b.  an atom of an element with the same number of protons but different numbers of neutrons c.  an atom of an element with the same number of protons but different numbers of electrons d.  an atom with a very small amount of strong force 2.  The isotope Boron-12 has an atomic mass of a.  5 b.  10 c.  11 d.  12
  11. 11. Exit Slip 3.  The isotope Carbon-14 has a.  one more electron than Carbon-12. b.  two more protons than Carbon-12. c.  a lower atomic mass than Carbon-12. d.  two more neutrons than Carbon-12. 4.  Which of the following is an alternative way to express Nitrogen-13? a.  137N b.  136N c.  147N d.  146N
  12. 12. Exit Slip 5.  Boron-13 has a.  13 protons, 8 neutrons, and 5 electrons b.  5 protons, 13 neutrons, and 5 electrons c.  5 protons, 8 neutrons, and 7 electrons d.  5 protons, 8 neutrons, and 5 electrons
  13. 13. Homework   Finish practice questions