MX3 (1 lone pair): trigonal pyramid - NH3, PCl3, H3O+.
Total number of domains = 4 (from 3 bonds and 1 lone pair). Based on a tetrahedral arrangement of the 4 domains.
MX3 (1 lone pair): trigonal pyramid - NH3, PCl3, H3O+.
Total number of domains = 4 (from 3 bonds and 1 lone pair). Based on a tetrahedral arrangement of the 4 domains.