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**For each molecule on the worksheet, the Lewis Dot Structure, the number of valence electrons, the electron arrangement (E.A.) and the molecular geometry (M.G.) are given, respectively. To see a larger view of the Lewis Dot Structure, point at the molecule, right click on the mouse and go to 'View image'. Click on the rotating molecule for summary of geometries.**

9.1 Lewis Electron Dot Diagrams

Learning Objective

Draw a Lewis electron dot diagram for an atom or a monatomic ion.

In almost all cases, chemical bonds are formed by interactions of valence electrons in atoms. To facilitate our understanding of how valence electrons interact, a simple way of representing those valence electrons would be useful.

**Practice Problems**

Answer the following questions and check your answers below. These problems are for practice only will not be graded.

Be sure you know how to draw correct Lewis Dot Structures and are able to correctly predict the electronic arrangement and molecular geometry before going on to the lab assignment.

Related Practice Problems

What is the molecular geometry of ICl 4-?

Trigonal bipyramidal

Tetrahedral

Square planar

The predicted geometry of ICl3 would be

1. trigonal pyramidal.

3. trigonal bipyramidal.

4. T-shaped.

5. trigonal planar.

The molecular geometry of ICl2− is

1. trigonal planar.

2. octahedral.

**A Brief Tutorial on Drawing Lewis Dot Structures**

We will use three molecules (CO2, CO32- and NH4+) as our examples on this guided tour of a simple method for drawing Lewis dot structures. While this algorithm may not work in all cases, it should be adequate the vast majority of the time.

**Procedure for Neutral Molecules (CO2)**

**Practice Problem Answers**

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