Problem: The NH3 molecule is trigonal pyramidal, while BF3 is trigonal planar. Which of these molecules is flat?

FREE Expert Solution
  • A trigonal pyramidal is a molecular geometry model with one atom (pink) at the apex and three atoms (white) at the corners of a trigonal base, resembling a triangular pyramid. The atom on the apex has a lone pair on it.
  • Trigonal pyramidal follows this shape due to the repulsion of the lone pair-bonding electrons which makes the angle between the lone pair -bonding electrons larger than angle between the groups attached. 
  • This will appear as:

  • NH3 follows this geometry where pink = N and white= Hs
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Problem Details

The NH3 molecule is trigonal pyramidal, while BF3 is trigonal planar. Which of these molecules is flat?

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