3 Atoms Bonded to a Central Atom BH3→>H:B:H Trigonal Trigonal H Planar H H Pyramidal T-Shaped B B H-B-H H H H H H SN=3 So Geometry is Trigonal Planar NH3→H:N:H Trigonal Trigonal H Planar Pyramidal H H T-Shaped N H-N-H N H H H H H SN=4 So Geometry is Trigonal Pyramidal VIll-83 Atoms Bonded to a Central Atom H N H H NH3 → N H H H N H H H Trigonal Pyramidal T-Shaped Trigonal Planar SN = 4 So Geometry is Trigonal Pyramidal BH3 → H B H H B H H H B H H H H B H H Trigonal Pyramidal T-Shaped Trigonal Planar SN = 3 So Geometry is Trigonal Planar H N H H VIII-8