Valence Electrons Presentation

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​Lewis Dot Diagrams

​A Lewis Structure is a very simplified representation of the valence shell electrons in a molecule. It is used to show how the electrons are arranged around individual atoms in a molecule.

​What is a Lewis Dot Diagram?

​In the center we have the symbol representing the element
Each dot is an electron

​What are we looking at?

How do we draw them?

​1. Determine how many valence electrons you have

By looking at the the group that the element belongs to

​2. Placing electrons

• Two things to note:
  Never put more than two electrons on a side
  Start by adding one electron to each side then add in the rest later

Valence Electrons

• Group 1 = 1 valence

• Group 2 = 2 valence

• Group 13 = 3 valence

• Group 14 = 4 valence

• Group 15 = 5 valence

• Group 16 = 6 valence

• Group 17 = 7 valence

• Group 18 = 8 valence

Transition Metals

Transition metals are different in that you have to use the electron configuration to determine valency