Lewis Dot DiagramLewis Dot Diagram(a.k.a. Electron Dot Diagram)(a.k.a. Electron Dot Diagram)

Lewis Dot Diagram is…Lewis Dot Diagram is…

A simplified way to draw A simplified way to draw valence valence electronselectrons for an element. for an element.

What are valence electrons?What are valence electrons?Electrons that are Electrons that are farthestfarthest away away

from the nucleus.from the nucleus.Electrons in the Electrons in the outsideoutside energy energy

cloud.cloud.

Bohr DiagramsBohr Diagrams

p+=3n=4

p+=3n=4

p+=1n=0

p+=1n=0

Lithium Hydrogen

How do you draw How do you draw Lewis Dot Diagrams?Lewis Dot Diagrams?

Write the element symbol.Write the element symbol.Determine what family it is in.Determine what family it is in.

LiLiThen…put dots around the symbol to Then…put dots around the symbol to

represent the valence electrons.represent the valence electrons.

How many valence electrons?How many valence electrons? Look at the family (or column) it is in on the Look at the family (or column) it is in on the

Periodic Table.Periodic Table. Family Family 11 has has 1 electron1 electron Family Family 22 has has 2 electrons2 electrons…etc.…etc.

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

K Ca Ga Ge As Se Br Kr

Rb Sr In Sn Sb Te I Xe

Cs Ba Tl Pb Bi Po At Rn

1e-

2e- 3e- 4e- 5e- 6e- 7e-

8e-or 2e-

Practice these:Practice these:

BB

NeNe