Edexcel IAL Chemistry AS 3.18 Molecular shapes and bond angles
Edexcel IAL Chemistry AS 3.18 Molecular shapes and bond angles
Count electron regions and lone pairs, identify the parent geometry and state the accepted angle, then explain any deviation through stronger lone-pair repulsion.
How this is tested
- Complete shape-and-angle tables for methane, ammonia, water, BeCl2 and BCl3.
- Draw and label three-dimensional structures for CO2, PCl5, SF6 and related species.
- Explain bond-angle changes when lone pairs or coordinate bonds alter repulsion.