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From Citizendium, the Citizens' Compendium

• van der Waals forces [r]: Weak forces between (closed-shell) atoms and molecules. Attractive for long distances, repulsive for short distances. Sometimes used as synonym for the attractive London (dispersion) force (the only attractive force between noble gases). [e]
• van der Waals equation [r]: An equation of state for a fluid composed of particles that have a non-zero size and a pairwise attractive inter-particle force [e]
• van der Waals radius [r]: A theoretical estimate of the size of an atom not engaged in a chemical bond. [e]
• Theoretical chemistry [r]: The description of atoms, molecules and reactions in mathematical form. [e]
• Theoretical physics [r]: The description of natural phenomena in mathematical form. [e]
• Thermodynamics [r]: The statistical description of the properties of molecular systems [e]
• Hydrogen bond [r]: A non-covalent and non-ionic chemical bond involving a hydrogen atom and either Fluorine, Nitrogen, or Oxygen. [e]