Hello ,

The shape of BF3 is bent T shaped and it can be explained using VSEPR theory as shown below :

• The central atom Br has seven electrons in valence shell
• There are three bond pairs and two lone pairs
• According to VSEPR theory, these will occupy the corners of trigonal bipyramid
• The two lone pairs will occupy the equitorial positions to minimize lone pair-lone pair repulsions which is greater the bp-bp repulsions
• The axial fluorine atoms will be bent towards the equitorial fluorine in order to minimize repulson .

Hope This Helps .