There's been an unsolved mystery associated with mixed valence compounds: when the valence state of an element in these compounds changes with increased temperature, the number of electrons associated ...
THESE lectures deal with the development of the theory of valency from its origin to the latest quantum-mechanical views on the subject. The subject is discussed concisely, but the exposition is clear ...
Mixed-valence compounds — which have one or more of the same metal atoms in different oxidation states — are fairly common, with examples such as Fe 3 O 4 and Prussian blue being known for some time.
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