We’re being asked to identify the **bond angle** in **SiCl _{4}**. Since we don’t know the Lewis structure for SiCl

*Step 1:* Determine the central atom in this molecule.

*Step 2:* Calculate the total number of valence electrons present.

*Step 3:* Draw the Lewis structure for the molecule.

*Step 4:* Determine the number of electron groups around the indicated atom.

*Step 5:* Determine the electron geometry and bond angle using this:

**Electron Regions Electronic Geometry Bond Angles**

2 linear 180˚

3 trigonal planar 120˚

4 tetrahedral 109.5˚

5 trigonal bipyramidal 90˚, 120˚, and 180˚

6 octahedral 90˚ and 180˚

What is the value of the bond angles in SiCl _{4}?

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Based on our data, we think this problem is relevant for Professor Keyes' class at BU.