Problem: Consider the Lewis structure for glycine, the simplest amino acid: What are the approximate bond angles at the nitrogen?

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We’re being asked to identify the bond angles around nitrogen in glycineSince the Lewis structure for glycine is already given, we simply need to do the following steps:


Step 1: Determine the number of electron groups around the indicated atom.

Step 2: 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˚


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Problem Details

Consider the Lewis structure for glycine, the simplest amino acid:

 An N with one pair of dots is single bonded left and below to H and right to C.  That C is single bonded above and below to H and right to C.  That C is double bonded above to O (which has two pairs of dots) and right to O (which also has two pairs of dots). That O is single bonded right to H.

What are the approximate bond angles at the nitrogen?

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