This document provides an overview of an upcoming chemistry class covering atomic structure. The weekly schedule outlines topics to be covered each day, including atomic radius, electronegativity, atomic structure, and a midterm exam on Friday. Students are instructed to sketch the periodic table and label families for homework. The document then reviews atomic structure, including the dense nucleus at the center containing protons and neutrons, and less dense electron shells. Examples are given to calculate protons, neutrons, and electrons in different atoms. Homework assigned is to make a study notecard and complete a review worksheet in preparation for the midterm.

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!