1. Lewis Dot Diagrams N

2. What Are They?
short hand for number of valence electrons an element has
useful for determining how elements bond chemically (we’ll do later)

3. What’s in one? Chemical symbols Dots
represents ALL inner electrons (e-)
Dots
represents ONLY the valence e-
valence e- are in the outermost energy level

4. Writing the Diagram Write chemical symbol
Determine the number of valence e-s
use group numbers!!
Each side has to have one dot before a pair of dots can be written

5. Examples Cl C Carbon Symbol: # of valence e-: Chlorine Symbol:4 7 Cl C

6. How To Find Neutrons Atomic number = # of Protons
# of Protons = # of Electrons
Atomic mass = # of Protons + # of Neutrons
FIND ON THE PERIODIC TABLE!!!!!!!