MX3 (no lone pairs): trigonal planar - BF3, BH3, CH3+.
Total number of domains = 3 (from 3 bonds and 0 lone pairs). Based on a trigonal planar arrangement of the 3 domains.
MX3 (no lone pairs): trigonal planar - BF3, BH3, CH3+.
Total number of domains = 3 (from 3 bonds and 0 lone pairs). Based on a trigonal planar arrangement of the 3 domains.