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Three-Domain Geometry: Trigonal Planar and Bent

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A central atom with three electron domains and no lone pairs is trigonal planar; with one lone pair among those domains, it is bent.

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Boron trifluoride, no lone pairs, is trigonal planar; sulfur dioxide, one lone pair among three domains, is bent.

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The electron-pair geometry stays trigonal planar in both cases; only the molecular geometry changes with a lone pair.

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