Bellringer
FOR CHLORINE (Cl)
1. DRAW THE BOHR MODEL
2. DRAW THE ORBITAL
DIAGRAM
3. WRITE THE LONGHAND
NOTATION
4. WRITE THE SHORTHAND
NOTATION
Bellringer
Orbital Diagram
Bohr Model
Longhand
1s2 2s2 2p6 3s2 3p5
Shorthand
[Ne] 3s2 3p5
Review Video
 Follow along in your notes with the video!
 http://www.youtube.com/watch?v=lqWL0WMtlYk
POP QUIZ!
BOOKS ON THE FLOOR
YOU WILL HAVE 10 MINUTES
Bellringer
FOR PHOSPHORUS(P)
1. DRAW THE BOHR MODEL
2. DRAW THE ORBITAL
DIAGRAM
3. WRITE THE LONGHAND
NOTATION
4. WRITE THE SHORTHAND
NOTATION
Phosphorus
Bohr Model
Longhand
1s2 2s2 2p6 3s2 3p3
Shorthand
[Ne] 3s2 3p3
 Objective: SWBAT determine the number of valence
electrons an atom has based on the Bohr model or its
position on the periodic table.
Valence electrons
 Valence electrons are the electrons in the last
shell or energy level of an atom.
 How to find them:

1. Look at the last shell/orbital in the electron
2. Look at the column in the periodic table

http://www.youtube.com/watch?v=GNJM4bAoFJw

How to talk/write them
 Valence electrons are the ONLY electrons that an
atom can use to share (create bonds)
 Creating molecules and chemical reactions is VERY
dependent on the number of valence electrons

***You absolutely, definitely need to know how to do this.
 How to show valence electrons when writing:
 Lewis Dot Structure
Lewis Dot Structures!
CHLORINE
CARBON
Practice
 Oxygen
 Nitrogen
 Boron
 Aluminum
 Magnesium
 Neon
 Helium
Homework
PRACTICE VALENCE ELECTRONS
LAB SET UP: READ, DIAGRAM SET UP, WRITE
PURPOSE