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MolView is a free online molecular viewer and editor that lets you draw chemical structures in 2D and visualize them in 3D. It also provides access to molecule data and crystal structures from online databases, with quick tools for exploring structure, bonding, and properties.
More resources on Chemical Bonding
OpenStax Chemistry - Bonding Chapter
Chapter 8 of the free OpenStax Chemistry 2e textbook, covering valence bond theory, hybrid atomic orbitals, sigma and pi bonds in multiple bonding, and molecular orbital theory, explaining properties such as oxygen's paramagnetism that Lewis structures and VSEPR cannot predict.
Chemistry
Master chemical bonding with this free Khan Academy course. Explore ionic, covalent, and metallic bonds to build a strong chemistry foundation.
Principles of Chemical Science (MIT 5.111SC)
Atomic and molecular electronic structure, periodic trends, bonding and molecular shape, thermodynamics, acid-base and redox equilibria, chemical kinetics and catalysis, assuming only high school chemistry. Includes 46 lecture videos, lecture notes, and problem sets and exams with solutions.
Chem LibreTexts - Acids and Bases
Open general chemistry textbook chapters covering acid-base definitions, ionization constants, pH calculations, polyprotic acids, buffers and hydrolysis, with worked examples and exercises. Suited to working through the theory at your own pace alongside a course.
Chemical Bonding
The 1980 edition of DeKock and Gray's Chemical Structure and Bonding, moving from atomic structure through valence bond, hybrid orbital and molecular orbital descriptions of diatomic and polyatomic molecules to transition-metal complexes and bonding in solids, with problems and answers.
The Nature of the Chemical Bond
Third edition (1960) of Linus Pauling's landmark monograph on structural chemistry, presenting resonance, hybrid orbitals, electronegativity, covalent and ionic radii, and hydrogen bonding, and showing how valence-bond ideas explain the structures of molecules, complexes, metals and crystals.