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Hydrogen bonding
Hydrogen bonding occurs when a hydrogen atom is covalently bonded to a highly electronegative atom (N, O, or F), creating a highly polar bond. The partially positive hydrogen atom $δ^+$ is then attracted to a lone pair of electrons on another electronegative atom in a nearby molecule.
Intermolecular forces
Intermolecular forces are the electrostatic attractions between molecules.
Retardation factor
The retardation factor, $R_f$, is a dimensionless ratio that describes how far a substance travels relative to the solvent front in chromatography.