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What is the role of unshared electron pairs in predicting molecular geometries?
Lone electron pairs give the geometry a triangular base.
If all of the electron groups around a central atom are bonding groups (that is there are no lone pairs) what is the molecular geometry for two electron groups?
linear
What is molecular shape of BF3?
The shape of this molecule is Trigonal Planar. this is because it has no lone pairs of electrons so it maintains a 2D shape.
What is the molecular geometry for BrF4?
When you do the VSEPR you get 6pairs of electron pairs and two lone pairs which means that when you look at the geometrical shape (by looking at how many pairs of electrons you got and in this cases its 6) the shape is octahedral but the molecular shape is square planar because you only have four atoms bonding and two lone pairs which means that the lone pairs have to be as far from each other as possible so they go on the two ends ( one on top and one on the bottom) which leavs the shape to be a square planar! i hope this helps you good luck. --------- TL;DR: Square Planar.
How does a lone pair distort the molecular shape?
A lone pair of electrons takes up space despite being very small. Lone pairs have a greater repulsive effect than bonding pairs. This is because there are already other forces needing to be taken into consideration with bond pairs. So to summarize: Lone pair-lone pair repulsion > lone pair-bond pair repulsion > bond pair-bond pair repulsion. This makes the molecular geometry different.
