1. Electrons & Elements
Physical Science
2017

2. Periods and Groups
Period = a horizontal row
Group = a vertical column

3. Label your table Label each period 1-7 from left to right
Then label each group 1-18 from top to bottom

4. Electron Shells
Shell = space around the nucleus where electrons are often found

5. Shell Breakdown Shell 1 = 2 Shell 2 = 8 Shell 3 = 18 Shell 4 = 32
Beyond 4 shells, there are other rules that come into play.

6. Bohr Electron Model

7. Examples
Hydrogen
Boron
Oxygen
Phosphorus
Argon

8. Light
Atoms can be identified by the light they emit when energized

9. Light
Atomic Spectrum = the pattern of frequencies formed by an element

10. Valence Electrons
The electrons found in the outermost energy level/shell of an atom.
Used in chemical bonding.

11. Lewis Structures Diagram showing bonding options and electron pairs.
Highlight your valence e- labels on your periodic table.

12. How to draw a Lewis Structure:
Must follow octet rule
Draw dots in a clockwise order
Mg Br

13. Classwork
Draw the Bohr Model of at least 1 element from period 1, 2, 3, and 4.
Draw the Lewis Structure for at least 1 element from each period 5, 6, and 7.