Isomer - IGCSE Chemistry Definition

An isomer refers to a molecule that shares the same molecular formula as another molecule but differs in structural arrangement, resulting in distinct chemical properties. In IGCSE Chemistry, students learn that isomers can vary in terms of the order of atom connections (structural isomers) or the spatial orientation of atoms (stereoisomers), despite having identical numbers and types of atoms.

Understanding isomers is important because they highlight how different chemical structures can influence the behaviour and characteristics of compounds, even when they are composed of the same elements in the same proportions.

Isomers Revision Resources to Ace Your Exams

For more information about isomers check out the following resources:

• Isomers Revision Notes

Explore our IGCSE Chemistry Revision Resources.