1. Today in Science
You will Need:
1)Pencil/Pen, Colored Pencils, Highlighters
or Markers; Periodic Table – Pgs. 196-197
2)Power Notes – Bohr Model Drawings +
Density Review– 1 pages 2 sides –
Bookshelf = This is Part 2
3)Any missing work you owe

2. Reminders
1. End of the Quarter is Friday, May 28th
2. Binder Check #2 – Due Tomorrow at the
beginning of class
3. Minimum Days Today and Thursday of
this week– 12:07 Dismissal – Schedule on
Front board.
4. Power Notes- Bohr Model Drawings
Review and Reflect on Page One Only –
Due FRIDAY.

3. Bohr Model of
Carbon
Atomic # = Protons “+”
and Electrons “-” if neutral
Atomic Mass = Sum of
Protons and Neutrons

4. Lewis Dot Diagrams
Example:
Beryllium is in Family #2
1. Illustrated using elements
Chemical Symbol and DOTS to
represent its’ VALENCE
electrons.
2. Beryllium has a VALENCE of 2
Be
1
2
3
4
5
6
7
8

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

6. Let’s try a couple:
Magnesium
Row=
Protons =
Neutrons =
Electrons =
Lewis Dot
3
12
+
24-
12=1212-
P =
12+
N = 12
2-
8-
Mg
2-

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

8. Practice and Review
Mass Unit Label = ___________
Volume Unit Label = _______,
________, ________
Density Unit Label = __________,
__________, __________
Gram
cm3
mL cc
g/cm3
g/mL g/cc

9. Density Formulas
1)There are 3 versions of the
Density formula:
D=m/v v= m/D
m= v x D

10. Density Formulas
1)Identify the type of numbers you
are given in the word problem.
2)Choose the correct version of the
Density formula
1)Tip: If you are given the mass
you will always DIVIDE
3)You may need to find VOLUME
first! (2 step problems)

11. Task List & Homework
1)Binder Check #2- Due
Tomorrow at the beginning of
class
2)Review and Reflect on Page
one of Power Notes – Bohr
Model Drawings ONLY
3)Bohr Model & Lewis Dot
Diagrams + Density Review –
Due Friday.