Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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The power of combining with another element or radical, i.e., the E number of atoms of other elements with which the atoms of any one element can combine directly. Hydrogen, for example, is univalent and therefore can only become attached to one atom of another element, e.g., it combines with chlorine, another univalent element, atom for atom, forming H-Cl (hydrochloric acid). Bivalent elements, e.g., oxygen, can combine with two, such as with two hydrogens, forming H 2 O. Valencies up to eight are possible.

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