Structure of ammonia, NH3. NH3 contains 3 bonded and one nonbonded electron domains, giving a tetrahedral e- domain geometry and a trigonal pyramidal molecular geometry. (AX3E). The H-N-H bond angles (107 degrees) are less than in a perfect tetrahedron because the lone pair electrons spread out more in space than bonded electron pairs, compressing the bond angle. A cartoon model of the electron density of the lone pair of electrons, represented by a translucent green spheroid, can be toggled on and off. Note that the shape of the spheroid does not represent the actual electron density of the lone pair, but allows you to visualize how the presence of that lone pair dictates the molecular geometry.
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