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Q: Boron trifluoride has 3 bonding domains and its electron domain geometry is trigonal planar?

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It will be trigonal planar in terms of electron domain geometry, and bent in terms of molecular geometry. Carbon will form a single bond with each hydrogen atom, and will have 2 electrons left over. A molecule with 2 bonding domains, and one non-bonding domain takes on a bent shape.

There is a non- bonding pair (lone pair) on the nitrogen giving it a trigonal planar domain geometry

trigonal pyramidal

Valence electron pairs will move as far apart from each other as possible. (Apex)

"Trigonal bipyramidal. There are 5 pairs of electrons. 3 bonding pairs and two lone pairs. Therefore the shape which minimizes repulsions is trigonal bipyramidal." This is slightly inaccurate. The geometry is trigonal bipyramidal but since there are two lone pairs of electrons, the molecule is T-shaped. The 2 lone pairs occupy equatorial positions. What I cannot find out yet is why the lone pairs are equatorial and not axial. Note the axial positions are slightly distorted from 180 degrees due to the fact that non bonding electron lone pairs have stronger repulsions than bonded electron pairs. --- The person who answered the question said "I cannot find out yet is why the lone pairs are equatorial and not axial." Here's why: In a trigonal bipyramidal ELECTRON geometry, you have three pairs at equatorial positions which means the angle between them is 120 degrees and you have two pairs at axial positions with angle of 90 degrees to the plane where you have the equatorial electron pairs. (If you want to see what I mean, search for the image "trigonal bipyramidal.") Now, recall that lone pairs are the most repulsive, "wanting" to be as far away as possible from the other electron pairs in order to minimize repulsion. So, they must be at the position with the greatest angle (120 degrees)... which is at an equatorial position.

Related questions

PH3 has 3 bonding pairs and 1 non-bonding pair of electrons. Its electron pair geometry is Tetrahedral and its molecular geometry is Trigonal Pyramidal.

It will be trigonal planar in terms of electron domain geometry, and bent in terms of molecular geometry. Carbon will form a single bond with each hydrogen atom, and will have 2 electrons left over. A molecule with 2 bonding domains, and one non-bonding domain takes on a bent shape.

The molecular geometry of H3O+ is Trigonal Pyramidal because it has 3 bonding pairs and 1 nonbonding pair (lone pair)

There is a non- bonding pair (lone pair) on the nitrogen giving it a trigonal planar domain geometry

Trigonal planar because it has three bonding pairs and one lone pair

the electronic geometry is the arrangement of REDs around the central atom. these REDs consist of both bonding pairs and lone pairs where the bonding pairs can either be single, double or tripple bonds. . REDs ELECTRONIC GEOMETRY 2 LINEAR 3 TRIGONAL PLANAR 4 TETRAHEDRAL 5 TRIGONAL BYPYRAMIDAL 6 OCTAHEDRAL

trigonal pyramidal

False

linear

Consider: Number of bonding domains on the central atom Number of non-bonding electron pairs (lone pairs) on the central atom

Consider: Number of bonding domains on the central atom Number of non-bonding electron pairs (lone pairs) on the central atom

Valence electron pairs will move as far apart from each other as possible. (Apex)