Number of lone pair(s) of electrons on central atom and the shape of molecule respectively, are:

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Number of lone pair(s) of electrons on central atom and the shape of  molecule respectively, are:

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(Bromine trifluoride):

Step 1 — Count valence electrons:
- Br: 7 valence electrons
- 3 × F: 3 × 7 = 21 valence electrons
- Total: 28 valence electrons

Step 2 — Lewis structure:
- 3 Br–F bonds use 6 electrons
- Remaining 22 electrons: 3 lone pairs on each F (18e) + 2 lone pairs on Br (4e)
- Br has 3 bonding pairs + 2 lone pairs = 5 electron pairs total

Step 3 — VSEPR geometry:
- 5 electron pairs → trigonal bipyramidal electron geometry
- 2 lone pairs occupy equatorial positions
- Shape: Bent T

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