ZINC, CADMIUM, AND MERCURY.pdf

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ZINC, CADMIUM, AND MERCURY • Many amalgams are of continuously variable compositions, while others are compounds, such as Hg2Na • Some of the transition metals do not form amalgams • Fe is commonly used for containers of Hg • Na amalgams and amalgamated Zn are frequently used as reducing agents for aqueous solutions
ZINC, CADMIUM, AND MERCURY • The Univalent State • Zn, Cd, and Hg form the ions M 2+ 2 . • Zn 2+ 2 and Cd 2+ 2 ions are unstable • Found only in melts or solids. • If one adds Zn to fused ZnCl2, this gives a yellow solution. • Upon cooling it gives a yellow glass, containing Zn 2+ 2 • The ions have a metal‐metal bond ( + M‐M + ); • the order of bond strength is : Zn 2+ 2< Cd 2+ 2< Hg 2+ 2.
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