Today in ScienceYou will Need:1)Pencil/Pen, Colored Pencils, Highlighters or Markers2) One sheet of lined paper set up for Cornell Notes3)Log #4 – Update – Managers Log in please4)Power Notes – Bohr Model Drawings + Density Review– 2 pages 4 sides – Bookshelf5)Textbook – Pgs 196-197

Reminders1. Signed and corrected test Grades on-

line – Returned Wednesday & Due Fri.2. Test #3 Retakes – Starts Monday 12/2

100/145 or below

1. Power Notes- Bohr Model Drawings Colored Pencils, Highlighters or Markers- must highlight notes

2. Review and Reflect on Page 1 only

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.

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.

Bohr Model of Carbon

Neutrons = Atomic

Mass Number – Atomic Number

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.

Electron Configuration

Valence electrons

Valence and the Periodic Table

Example:

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

- 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)

Metals give away their electrons, while nonmetals take.

Transition Elements

Cornell Note Paper

Remember:

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

Lewis Dot Diagrams

Example:

Beryllium is in Family #2

1. Shows only valence electrons2. Illustrated using ELEMENT

SYMBOL and DOTS to represent only the valence electrons.

3. Therefore Beryllium has a VALENCE of 2

Be

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.

Let’s try a couple:

LithiumRow=

Protons =

Neutrons =

Electrons =

Lewis Dot

2

3+

7-3=4

3 -

P = 3+N = 4

2 -1 -

Li

Let’s try a couple:

OxygenRow=

Protons =

Neutrons =

Electrons =

Lewis Dot

2

8+

16-8=8

8 -

P = 8+N = 8

2 -6 -

O

Let’s try a couple:

MagnesiumRow=

Protons =

Neutrons =

Electrons =

Lewis Dot

3

12+ 24-

12=1212 -

P = 12+N = 12

2 -8 -

Mg

2 -

Today’s Tasks1)Power Notes- Bohr Model Drawings + Density Review– Due by Wed

2)Retakes for Test #3 – Starts Monday, Dec. 2nd.