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Valence Electrons

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Lindsey Drobnich

on 15 October 2012

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Transcript of Valence Electrons

Valence Electrons Bellringer 1. Draw an atom of Lithium.

2. A pure substance is heated over a flame, and you observe a brilliant red light. Provide a possible explanation for this occurrence. Octet Rule Exit Ticket What is a valence electron?

Draw a Bohr model of an oxygen atom.

How many valence electrons does a neutral oxygen atom have?

Draw a Lewis Dot diagram for Be. Lewis Structures Valence Electrons: electrons in the outer shell Bohr Model The Bohr model has pros and cons.
It suggests that electrons "orbit" the nucleus in a predictable path.
It adequately describes what happens in the hydrogen atom, but has problems as atoms get larger.
This model does allow us to visualize several important features of an atom.
This model is simple to use. Atoms tend to combine in a way that will allow them to have eight electrons in their outer shell. **Important note: This should be considered a rule of thumb. In other words, there are exceptions!! Why are valence electrons important? They determine how atoms fit together, or bond.

Atoms bonding together results in practically everything that you see and more. aka: Lewis dot diagrams, electron dot diagrams, electron dot structures Lewis structures allow us to keep track of an atom's valence electrons easily. To create a Lewis structure:
1. Write down the chemical symbol for the element.
2. Draw a dot for each valence electron around the chemical symbol. (Hint: Draw the electrons in pairs when possible.)
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