Randić's molecular connectivity index

Randić's molecular connectivity index, often referred to simply as the connectivity index, is a topological descriptor used in cheminformatics and computational chemistry to quantify the connectivity of a molecular structure. Introduced by the chemist Ljupko Randić in the 1970s, this index provides insights into the properties of chemical compounds based on their molecular graphs. The connectivity index is defined for a molecular graph, where vertices represent atoms and edges represent bonds between them.