Chromatographic attractive forces resulting when the small atom size approaches very close to the negative end of a dipole are known as:

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A special category of dipolar interactions is seen with molecules capable of forming intermolecular hydrogen bonds with an electronegative center of another molecule.The hydrogen atom has a high degree of positive character when covalently linked to an electronegative atom such as oxygen.Because of its small size, this hydrogen atom with its high degree of positive character can approach the negative end of a neighboring dipole very closely, forming a strong interactive force associated with chromatographic retention.

Chromatographic Attractive Forces Resulting When the Small Atom Size Approaches