Electron localization function

Electron Localization Function (ELF) is a scientific tool used by chemists to study how electrons are distributed in molecules. It basically tells us which parts of a molecule have the most electrons (the parts where the electrons are "localized") and which parts have the least. ELF can be useful for predicting how molecules will react with each other, because those parts of the molecule with the most electrons will be the parts that interact most strongly with other molecules. It's like a map that we use to show which parts of the molecule are more important than others.