Chemical Bonds: An introduction to atomic and molecular structure

This is a great supplementary book for an introductory-level college chemistry course. It explains major concepts and theories in full detail, but refrains from the intense mathematical derivations of some functions that aren't required for a general chemistry course. Gray uses a common-sense approach in tackling complex functions, visually showing their physical counterparts (such as orbitals in the case of the Schrodinger Equation) rather than relying solely on equations.

This was one of the books used in my introductory freshman chemistry class at my university. It has highly informative, yet concise explanations covering the basics of molecular orbital theory. While I preferred this book to our other text for its conciseness, those without a good background in chemistry may have a difficult time with the book for the same reason. My only complaint about the book is that Gray uses CGS units instead of SI.