1) Today's science lesson covers drawing Bohr models of atoms and reviewing electron configuration and the periodic table. Students are given notes on the Bohr model and reminded of assignment due dates. 2) The document explains how the Bohr model represents atoms similarly to the solar system and how it can be used to understand electron configuration and chemical bonding. Instructions are provided for drawing Bohr models of different elements. 3) Students are asked to complete power notes on Bohr model drawings and density review that are due Wednesday, as well as turn in a signed and corrected test by Wednesday. Test retakes for Test 3 will begin on Thursday.

1. Today in Science
You will Need:
1)Pencil/Pen, Colored Pencils, Highlighters or
Markers
2) One sheet of lined paper set up for Cornell
Notes
3)Log #4 – Update – Managers in charge today
4)Power Notes – Bohr Model Drawings +
Density Review– 2 pages 4 sides – Bookshelf

2. Reminders
1. Signed and corrected test due on Wed.
2. Test #3 Retakes – Starts Thurs. -no notes
3. Power Notes- Bohr Model Drawings
Colored Pencils, Highlighters or Markers-
must highlight notes
4. Review and Reflect on Page 1 only

3. Bohr Model Drawings
The concept of elements has been around
since ancient times. We now know that
each element has its own unique number
of protons. Although each element can
have a varying amount of neutrons or
electrons, its basic characteristics,
properties and how it reacts with other
elements is basically the same.

4. Bohr Model Drawings
Neils Bohr is the scientist responsible for
the atomic model that looks very much like
our solar system. The Periodic Table not
only tells us about each individual atom
but is also set up to show us how to draw
the Bohr Model….well, at least for the first
three rows.

5. Neutrons = Atomic
Mass Number – Atomic
Number
Bohr Model of
Carbon

6. Bohr Model Drawings
The Bohr Model is helpful in not only
understanding the electron configuration
but for also understanding why and how
some elements will bond with other
elements.

7. Electron Configuration
Valence electrons

8. Cornell Note Paper
Valence and the Periodic
Table
Transition Elements
1. The columns or families each
element is located in tells you
the number of valence
electrons for families 1,
2…..13,14,15,16,17 and 18
Example:
-
Remember:
Metals give away their electrons,
while nonmetals take.
Elements in Family 1 have 1
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)

9. Basic Configuration
Example:
1.The Periodic Table Connections
– 1st 3 rows only
-Rows = # of shells or levels
around the nucleus
-# of elements in each row = # of
electrons found on that level
Row
1=
1 shell around nucleus;
maximum of 2 electrons on shell
Row
2=
2 shells around nucleus;
maximum of 8 electrons on shell
Row
3=
3 shells around nucleus;
maximum of 8 electrons on shell

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

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

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

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

14. Let’s try a couple:
Magnesium
Row= 3
Protons = 12
+
Neutrons = 2412 Electrons = 12=12
Lewis Dot
P =
12+
N = 12
Mg
2-
8-
2-

15. Today’s Tasks
1)Power Notes- Bohr Model Drawings +
Density Review– Due by Wed
2)Signed and Corrected Test #3 - Due
Wed.
3)Retakes for Test #3 – Starts Thur.