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Date: 29-6-2020
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AX3 Molecules: BCl3 ( Three Electron Groups )
1. The central atom, boron, contributes three valence electrons, and each chlorine atom contributes seven valence electrons. The Lewis electron structure is
2. There are three electron groups around the central atom. To minimize repulsions, the groups are placed 120° apart .
3. All electron groups are bonding pairs (BP), so the structure is designated as AX3.
4. with three bonding pairs around the central atom, the molecular geometry of BCl3 is trigonal planar.
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