1. CHEMISTRY December 3, 2014
VALENCE ELECTRONS

2. SCIENCE STARTER
Log onto the computer and do the Science Starter 12/3/2014
You are seated and silent
You have 3 minutes

3. SS REVIEW
Valence electrons are located where?
What element is located at Period 3 Group 2?   
Which group has 3 valence electrons?   

4. GROUPS NAME REVIEW Group 1 hydrogen (only H)
Group 1          alkali metals (all but H)
Group 2          alkaline earth metal
Group 3-12    (collectively) transition metals
Group 13 boron
Group 14 carbon
Group 15 nitrogen
Group 16        chalcogens
Group 17        halogens
Group 18        Noble gases

5. VALENCE ELECTRONS
The period number is the same as the number of occupied energy levels of an atom in its ground state.
The outer most energy level (last number in the electron configuration) is the valence level and the electrons in this energy level are the valence electrons.
In a chemical reaction, the valence electrons can be lost, gained or shared. Therefore, they determine the chemical properties of the elements.

6. VALENCE ELECTRON EXAMPLECa O Mg Ba Ne

7. LEWIS DOT STRUCTURE DEFINITION
A WAY OF REPRESENTING ATOMS OR MOLECULES BY SHOWING ELECTRONS AS DOTS SURROUNDING THE ELEMENT SYMBOL

8. LEWIS DOT STRUCTURE FIND THE ELEMENT FIND THE ELECTRON CONFIGURATION
DRAW THE LEWIS DOT STRUCTURE

9. LEWIS DOT STRUCTURE EXAMPLELi

10. LEWIS DOT STRUCTURE He

11. LEWIS DOT STRUCTURE Li

12. LEWIS DOT STRUCTURE B

13. LEWIS DOT STRUCTURE O

14. LEWIS DOT STRUCTURE Ar

15. AIM
Using R.A.C.E, respond to the following AIM prompt:
What is the relationship between elements within the Alkali Metal group?