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Updated: May 21, 2025
The amount of iodine absorbed by some of the fatty acids is illustrated by the following items: Of the halogens employed in the examination, iodine is preferable to either chlorine or bromine; it acts but slowly at ordinary, but energetically at elevated temperatures.
We wouldn't have the chance of a hydrogen atom in a tank of halogens." Vorongil's slanted eyebrows made a single unbroken line. "That's the word then. Bartol, find us the closest star with a planet spaceport or not." Bart's hands were shaking with sudden fear.
As hydrogen is generally taken as the standard, in practice the valency of an atom is the number of hydrogen atoms it will combine with or replace. Thus chlorine and the rest of the halogens, the atoms of which combine with one atom of hydrogen, are called univalent, oxygen a bivalent element, and so on.
The groups of fatty acids are distinguished by a characteristic deportment toward halogens; while members of the first series are indifferent to haloids, those of the second and third class combine readily, without suffering substitution, with two respectively four atoms of a haloid. In view of this behavior the first series is termed saturated, the second and third that of unsaturated acids.
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