NH3 (Ammonia) Molecular Geometry, Bond Angles (and Electron Geometry)
An explanation of the molecular geometry for the NH3 ion (Ammonia) including a description of the NH3 bond angles. The electron geometry for the Ammonia is also provided.
The ideal bond angle for the Ammonia is 109.5° since it has a Trigonal pyramidal molecular geometry. Experimentally we would expect the bond angle to be approximately 107°.
To determine the molecular geometry, or shape for a compound like NH3, we complete the following steps:
1) Draw the Lewis Structure for the compound.
2) Predict how the atoms and lone pairs will spread out when the repel each other.
3) Use a chart based on steric number (like the one in the video) or use the AXN notation to find the molecular shape. This will be determined by the number of atoms and lone pairs attached to the central atom.
If you are trying to find the electron geometry for NH3 we would expect it to be Tetrahedral.
Helpful Resources:
• How to Draw Lewis Structures: • How to Draw Lewis Structures: Five Ea...
• Molecular Geometry and VSEPR Explained: • Molecular Geometry: Rules, Examples, ...
• Molecular Geo App: https://phet.colorado.edu/sims/html/m...
Get more chemistry help at http://www.breslyn.org
Drawing/writing done in InkScape. Screen capture done with Camtasia Studio 4.0. Done on a Dell Dimension laptop computer with a Wacom digital tablet (Bamboo).
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