This book summarizes recent progress in the development of atomically precise nanochemistry and will be an important state-of-the-art reference for the broad communities of nanoscience and cluster science, ranging from chemistry, physics, biology, materials science, to engineering. The book is divided into six parts, each covering a different type of nanocluster: metal nanoclusters (Au, Ag, Pd, Pt, Al, alloys), semiconductor nanoclusters (CdSe, ZnS, InAs), metal-oxo systems (Mo-O, Ti-O, W-O), large-sized organometallic nano-architectures, carbon clusters (fullerenes, small nanoribbons), and supramolecular architectures. For each type of nanocluster, chapters cover experimental aspects - synthesis, structure and applications - and theory - electronic structure, geometry, and bonding ?- with a focus on structure-property relationships throughout the book.