Talk:Trigonal pyramidal molecular geometry
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I think is somewhat incorrect in its explanation for the trigonal geometry in ammonia: trigonal geomery arises because the fourth vertex of the tetrahedron is invisible when you have a lone pair instead of a covalent bond. Therefore the N atom, that would normally be at the center center of tetrahedron (eg. in case of NH4+) it is now seen at the vertex of a new, trigonal pyramid. This is not the same as saying that trigonal geomery arises FROM tetrahedron distortion. In case of the water molecule there is also slight distortion of the tetrahedral geometry due to the two lone pairs, but it is stil tetrahedral geometry! A picture would improve this article a lot.
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