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10/15 Review: Atomic Structure
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10/15 Review: Atomic Structure

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  • 1. Launch   Grab your binder and immediately take a seat   Take out last night’s homework 1.  From memory, sketch out the periodic table and label the 5 families. 2.  What family do the following belong to? i.  Sr ii.  I iii.  Fr iv.  Xe
  • 2. Weekly Schedule   Monday: Atomic Radius   Tuesday: Electronegativity & Ionization Energy   Wednesday: Metals, nonmetals, special groups   Thursday: Atomic structure & nuclear processes   Friday: Mid-Term Exam   Only excused absences, otherwise 0!   No retakes! We don’t have much time! If you don’t understand something, ask!
  • 3. Review Session Today   During lunch   After school (until 4:30pm)
  • 4. How is the atom structured? Mr. Heffner 10/15/09
  • 5. How is the atom structured? 0 Nucleus 0 Rings 0 • Protons (1 amu) • Electrons (0 amu) • Neutrons (1 amu) 0 valence = outermost
  • 6. How is the atom structured?   Density comparison:   The nucleus   Large mass   Small volume   Dense!   The rings   Small mass   Large volume   Not Dense!
  • 7. How is the atom structured? 5 Atomic number Atomic B Boron Really important! mass 10.81
  • 8. Example #1 How many protons, neutrons, and electrons does an atom of nitrogen have?   Step 1: Find the # of protons   Atomic number 7   Step 2: Find the # of neutrons   Atomic mass – atomic number 14 - 7 = 7   Step 3: Find the # of electrons   Same as # of protons 7 What about valence electrons?
  • 9. Example #2 Isotope: different # of neutrons How many protons, neutrons, and electrons does an atom of nitrogen-15 have?   # of protons   Atomic number 7   # of neutrons   Atomic mass – atomic number 15 - 7 = 8   # of electrons   Same as # of protons 7
  • 10. Nuclear Review   Two forces in the nucleus:   Strong force: holds the nucleus together   “Bungees”   Electrostatic repulsive force: tries to break it apart   Protons fighting   There are three types of radioactive decay:   Alpha ( ) decay   Beta ( ) decay   Gamma ( ) decay
  • 11. Practice Questions   Review Worksheet #4
  • 12. Notecard   One notecard, front and back   Things I would include:   Definitions: isotope, atomic number, alpha particle, valence electron, density of nucleus…   Pictures of the trends   Families on the periodic table
  • 13. Homework   Make a notecard   Finish Review Worksheet #4   Study hard!   Review your notes   Check out our exit slips online!