Intramolecular electron density pattern

In this monograph, the concept of acid-base function is based on the inevitable change in intramolecular electron density pattern as molecules approach each other, a change giving rise to intermolecular forces. It is appreciated that there is a wide range of intensities, but I contend that any attempt to draw a line of demarcation between what certain persons call physical as distinct from chemical interactions is not merely arbitrary but unnecessary and undesirable. Descriptions involving such a distinction carry ad hoc reservations and excuses which tend to cancel out on passing from one specialist to another. 

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