Note 898

The word "bridge" turns out -- in contrast to a different assessment -- to be truly useful. One might also supplement this image by the image of knotting or sewing or suturing. The H-bond can also be viewed electronically [thus not merely electrostatically]. But one may, with the advantage of distinguishing, introduce the concept of "protonic". If behind the protonic, now stands, it is true,  also  the electronic, then one should not overlook the fact that behind the electronic bond always do stand the nuclei, the atomic trunks, albeit passively so (because only the outer electrons can participate in bonding).

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