Edexcel IAL Chemistry AS 3.19 Predicting molecular shapes
Edexcel IAL Chemistry AS 3.19 Predicting molecular shapes
Draw the central atom's bonding and lone pairs, select the minimum-repulsion geometry and adjust the ideal angle when lone pairs or multiple bonds change repulsion.
How this is tested
- Predict shape and bond angle from bonding-pair and lone-pair counts in unfamiliar species.
- Justify geometry by arranging electron regions for minimum repulsion around the centre.
- Adjust ideal bond angles for lone-pair or multiple-bond repulsion where supported.