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univalent negative ions X
Each heptavalent manganese ion is derived from a salt, such as MnX′ 7 or Mn 2 Y″ 7 , and, consequently, when two manganese ions Mn 7+ are reduced, ten univalent negative ions X′, or five bivalent ions Y″, are liberated and become available for salt formation with the ferric ions, produced, or with the hydrogen ions (from hydroiodic acid) set free by the oxidation of the iodide ions to iodine.
— from The Elements of Qualitative Chemical Analysis, vol. 1, parts 1 and 2. With Special Consideration of the Application of the Laws of Equilibrium and of the Modern Theories of Solution. by Julius Stieglitz

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