1. Today in Science
You will Need:
•Pencil, Colored Pencils, Highlighters or
Markers, Textbook open to P.T.
•Power Notes – Classification of Matter –
Part 2 – 2 page 4 sides-Bookshelf- Staple
to yesterday’s paper

2. Check Date Date Name of Assignment Possible Earned
Off Given Due Pts. Pts.
3/15 3/15
Test #2 Part 1 (on-line) 95
3/16 3/16 Test #2 Part 2 (written),
155/8/20
Extra Credit, Notes
Test Corrections & 40
3/19 3/22 Signature
3/19 3/23 STAR CARDS #1-30 60
Power Notes –
3/19 3/21 Classifications of Matter &
Periodic Table - Overview
Test Retakes starting Tues.
Mar. 20 th until Tues. Mar.
27 th

3. Topic:
Bohr Model vs. Electron Cloud
Quantum Numbers
Example

4. Electron Configuration
Valence electrons

5. Valence and the Periodic • The columns or families each
element is located in tells you the
Table number of valence electrons for
families 1, 2…..13,14,15,16,17
Transition Elements and 18
- Elements in Family 1 have 1
Example: valence electrons
- Elements in Family 2 have 2
valence electrons
- Elements in Family 13 have
3 valence electrons
2. The pattern continues up to
Family 18
3. The pattern DOES NOT occur
for the Transition elements
(short columns)

6. Remember: Metals give away their electrons, while
nonmetals take.
Basic Configuration •The Periodic Table Connections –
1st 3 rows only
-Rows = # of shells or levels
around the nucleus
-# of elements in each row = # of
Example: electrons found on that level
Row 1 shell around nucleus;
1= maximum of 2 electrons on shell
Row 2 shells around nucleus;
2= maximum of 8 electrons on shell
Row 3 shells around nucleus;
3= maximum of 8 electrons on shell

7. Lewis Dot Diagrams 1. Shows only valence electrons
2. Illustrated using ELEMENT
SYMBOL and DOTS to
represent only the valence
electrons.
Example: 4. Beryllium is in Family 2
Beryllium is in Family #2 5. Therefore Beryllium has a
VALENCE of 2
Be

8. Drawing the Bohr Models • Locate the element on the P.T.
• Record the info about the
and Lewis Dot Diagrams element.
• Draw the nucleus and write
the # of each type of
subatomic particle inside.
• Draw the correct amount of
shells outside the nucleus
based on the row #
• Start loading electrons on the
specific shells from the inside
out.
• Remember: YOU MUST load
each shell full before moving
farther out to the next shell.

9. Let’s try a couple:
Lithium
Row= 2
Protons = 3 + 1-
P = 3+
2-
Neutrons = 7-3=4 N = 4
Electrons = 3 -
Lewis Dot
Li

10. Let’s try a couple:
Oxygen
Row= 2
Protons = 8 + 6-
P = 8+
2-
Neutrons = 16-8=8 N = 8
Electrons = 8 -
Lewis Dot
O

11. Comparing Bohr Model w/
Modern Atomic Theory
Textbook pg. 169
http://dwb4.unl.edu/chemAnime/BOHRQD/BOHRQD.html
•List 3 unique qualities of Bohr’s atomic model.
•List 3 unique qualities of the Modern Atomic Theory
(Electrons Cloud)
•List 3 similarities between these two models.
Bohr Electron
Model Cloud
Both

12. Review
• Answer review questions #1-15 using
your notes to help you.
• Review and Reflect on ALL PAGES
• Due Tomorrow

13. Homework
1) Complete All Pages by Tomorrow
Due Tomorrow
2) STAR CARDS #1-30 –
Due Friday at the beginning of class