 Stereochemistry

Stereochemistry is a branch of chemistry that focuses on the spatial arrangement of atoms within molecules and how this arrangement affects their physical and chemical properties. It primarily deals with isomerism, which is the phenomenon where compounds can have the same molecular formula but different structures or arrangements of atoms. There are several key concepts in stereochemistry: 1. **Isomers**: Molecules with the same molecular formula but different structural arrangements.

Molecules that are the same if you just look at "what atom is linked to what atom", they are only different if you consider the relative spacial positions of atoms.