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# Shapes of molecules watch

1. When a lone pair is involved in a dative covalent/ coordinate bond with another atom is it then considered as a bonding pair (when considering the shape of the moelcule?)
For example I thought the F-B-F angle in H3NBF3 would be 107 (trigonal) because there are 3 bonding pairs around the central B atom, and one lone pair, however it is 109.5, implying a tetrahedral shape and that the central atom has 4 bonding pairs around it.

I hope that makes sense!
2. H3NBF3? Which is the central atom?
3. (Original post by annaj97)
When a lone pair is involved in a dative covalent/ coordinate bond with another atom is it then considered as a bonding pair (when considering the shape of the moelcule?)
For example I thought the F-B-F angle in H3NBF3 would be 107 (trigonal) because there are 3 bonding pairs around the central B atom, and one lone pair, however it is 109.5, implying a tetrahedral shape and that the central atom has 4 bonding pairs around it.

I hope that makes sense!
4. (Original post by annaj97)
When a lone pair is involved in a dative covalent/ coordinate bond with another atom is it then considered as a bonding pair (when considering the shape of the moelcule?)
For example I thought the F-B-F angle in H3NBF3 would be 107 (trigonal) because there are 3 bonding pairs around the central B atom, and one lone pair, however it is 109.5, implying a tetrahedral shape and that the central atom has 4 bonding pairs around it.

I hope that makes sense!
The basic shape (before VSEPR distortions) adopted by the electron domains around any atom is only dependent on the number of domains.

Four domains = tetrahedral
5. [QUOTE=zetamcfc;65193151]
Thank you!!
6. (Original post by charco)
The basic shape (before VSEPR distortions) adopted by the electron domains around any atom is only dependent on the number of domains.

Four domains = tetrahedral
Thank you!!

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