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

2. Reminders
1. Test #2 Retakes – Thurs. 1/2 page of notes
2. Binder Check #2 – Due Thur at the beginning
of class
• Please check your grades for Accuracy-
• Print Progress Notice & Get signed for Binder
1. Power Notes- Bohr Model Drawings
Colored Pencils, Highlighters or Markers-
must highlight notes
2. Review and Reflect on Page 1

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. Valence and the Periodic 1. 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)

9. Remember: Metals give away their electrons, while
nonmetals take.
Basic Configuration 1.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

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

11. Drawing the Bohr Models 1. Locate the element on the P.T.
2. Record the info about the
and Lewis Dot Diagrams 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 + 1-
P = 3+
2-
Neutrons = 7-3=4 N = 4
Electrons = 3 -
Lewis Dot
Li

13. 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

14. Today’s Tasks
1)Power Notes- Bohr Model Drawings +
Density Review– Due by Friday (There
is NO time to work in class tomorrow)
2)Binder Check #2 - Due Thur
• Cover Page
• Table of Contents
• Grade Print out
1)Test #2- ½ page of notes, done by
hand, front side only – Due Thur.

15. Homework
1)Power Notes– Due by Friday(There is
NO time to work in class tomorrow)
2)Binder Check #2 –Due at the
beginning of class on Thur.
3)Test #2- ½ page of notes, done by
hand, front side only – Due Thur.
Do You see HOW the periodic table
and the Atomic Structure are