1. Goals
To draw atoms in 2 different ways

2. Bohr Models We can use the periodic table to draw Bohr Models.
These are also referred to as Planetary Models

3. Bohr Models In these models we represent the p+, e-, & n0
We already know that p+ and n0 are located in the nucleus at the center.

4. Bohr Models
The electrons are located in the electron cloud in energy levels.
1st level holds max 2 e-
2nd level holds max 8 e-
3rd level holds max 18 e-
4th level holds max 32 e-

5. Lewis (Dot) Diagrams
Electron dot diagrams are structures that show ONLY the valence electrons as dots
Valence electrons are:
Electrons located in the outer energy shell of an atom

6. Lewis (Dot) Diagrams put the chemical symbol in the middle
To draw the diagram:
put the chemical symbol in the middle
draw the electrons as dots around the symbol.
One electron at a time (start at the top)
Only can pair up AFTER one electron is placed on each side
Move clockwise.

7. Part 3: Periodic Table Basics
Complete cards w/ diagrams
Color cards according to key on front page
Cut cards out and place according to directions
Answer questions on following page