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- Name : Cadmium
- Symbol : Cd
- Atomic # : 48
- Atom weight: 112.41
- Melting P. : 320.9
- Boiling P. : 765
- Oxidation : +2
- Pronounced : KAD-me-em
- From : Greek kadmeia, ancient name for calamine (zinc oxide)
- Identified : Friedrich Strohmeyer in 1817
- Appearance : Soft, malleable, blue-white metal
- Note : Used for electroplating steel and in the manufacture of
- bearings.
-
- [Properties]
-
- Cadmium is a bluish-white, malleable and ductile metal. Like zinc, it
- "cries" when rapidly bent. It can be polished to a lustrous finish, but
- gradually dulls as a thin layer of oxide forms.
- Cadmium is in the middle of the IIB zinc group on the periodic table.
- Zinc and cadmium share a few chemical and physical properties. Mercury,
- located just below cadmium on the periodic table, has the lowest melting
- point of all the metals. Cadmium's melting point is not that low, but it
- can be made to boil at about 321 degrees. Boiling cadmium gives off a
- poisonous and weird, yellow-colored vapor.
- Although cadmium can be found in a few, widely scattered minerals, it is
- not economically feasible to extract the metal from those minerals. Cadmium,
- however, is nearly always found as an impurity in natural zinc ores.
- When zinc is refined in a blast furnace, cadmium can be found in dust
- that is regularly scraped from the flues and stacks. In electrolytic zinc-
- refining operations, the anode slime contains a high percentage of
- cadmium metal.
-