Post on 25-Jun-2015
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
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!
Review Session Today During lunch
After school (until 4:30pm)
How is the atom structured?
Mr. Heffner 10/15/09
How is the atom structured?
0
0
0
0 Nucleus
Rings • Protons (1 amu) • Neutrons (1 amu) • Electrons (0 amu)
valence = outermost
How is the atom structured? Density comparison:
The nucleus Large mass Small volume Dense!
The rings Small mass Large volume Not Dense!
How is the atom structured?
Atomic number 5
B Boron 10.81 Atomic
mass
Really important!
Example #1 How many protons, neutrons, and electrons does an atom
of nitrogen have?
Step 1: Find the # of protons Atomic number
Step 2: Find the # of neutrons Atomic mass – atomic number
Step 3: Find the # of electrons Same as # of protons
7
14 - 7 =
7
7
What about valence electrons?
Example #2 How many protons, neutrons, and electrons does an atom
of nitrogen-15 have?
# of protons Atomic number
# of neutrons Atomic mass – atomic number
# of electrons Same as # of protons
7
15 - 7 =
7
8
Isotope: different # of neutrons
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 (α) decay
Beta (β) decay Gamma (γ) decay
Practice Questions Review Worksheet #4
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
Homework Make a notecard
Finish Review Worksheet #4
Study hard! Review your notes
Check out our exit slips online!