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!