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One gram of an oxide of iron is fused with potassium acid sulphate and the fusion dissolved in acid. The iron is reduced with stannous chloride, mercuric chloride is added, and the iron titrated with a normal K Cr O solution. 12.94 cc. were used. What is the formula of the oxide, FeO, Fe O , or Fe O ? !Answer!: Fe O . !Answer!: Monovalent.
Evidently, then, one atom is not always equivalent to another atom of a different kind in combining powers. The words monovalent, divalent, trivalent, tretrava-lent, etc., were coined to express this most important fact, and the various elements came to be known as monads, diads, triads, etc.
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