Today in ScienceYou will Need:1)Pencil/Pen, Colored Pencils, Highlighters or Markers; Periodic Table – Pgs. 196-1972)Power Notes – Bohr Model Drawings + Density Review– 1 pages 2 sides – Bookshelf = This is only Part 13)Log #2 – Update – Managers in charge today

Reminders1. End of the Quarter is Friday, May 28th2. Minimum Days on Tuesday and

Thursday of this week– 12:10 Dismissal3. Binder Check #2 – Due Wednesday4. Power Notes- Bohr Model Drawings

Colored Pencils, Highlighters or Markers- must highlight notes; Periodic Table

5. Review and Reflect on Page One 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(isotope) or electrons(ion), 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 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.

-Magic # is 8,-Magic # is 2 for H and He

Bohr Model of Carbon

Atomic # = Protons “+” and Electrons “-” if neutralAtomic Mass =

Sum of Protons and Neutrons

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)

Transition Elements

REVIEW

Remember: Metals give away their electrons, while nonmetals take.

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. Illustrated using elements Chemical Symbol and DOTS to represent its’ VALENCE electrons.

2. Beryllium has a VALENCE of 2

Be1

2

34

5

6

7

8

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:

MagnesiumRow=Protons =Neutrons =Electrons =

Lewis Dot

3

12+24-12=1212-

P = 12+N = 12

2-8-

Mg

2-

Let’s try a couple:

OxygenRow=Protons =Neutrons =Electrons =

Lewis Dot

2

8+

16-8=88-

P = 8+N = 8

2-6-

O

Homework1) Review and Reflect on Page one of Power Notes – Bohr Model Drawings

2)Minimum Day tomorrow – Per. 1,3,4,5,7

3)Binder Check #2- Due Wed.