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A soft, silvery-blue metal which tarnishes in air. It is a cumulative poison and particularly toxic if inhaled.
 Balls Balls.
These 2" cadmium balls can be bought in huge quantities (and only in huge quantities) from suppliers to the electroplating industry. They are also often available one at a time on eBay. Basically they are just pure cadmium, meant to be dissolved into an electroplating bath to be plated onto steel objects for corrosion resistance.
Source: Plating supplier
Size: 2"
Purity: 99.9%
 Nickel-Cadmium (NiCad) rechargeable battery Nickel-Cadmium (NiCad) rechargeable battery.
Nickel-cadmium batteries, or "nicads" as they are often called, used to be the standard rechargeable design. These days they are being replaced by lithium ion and nickel metal hydride types - although these are currently more expensive. Unlike nicads, the new types do not suffer from the "memory" effect whereby a battery that is partially charged several times in succession can temporarily lose its ability to take a full charge. Another reason why nicads are being phased out is that they present a disposal problem. This cell contains over 10g of toxic cadmium and is likely to end up in a landfill site where it will eventually corrode and may pollute ground water.
Source: RS Components
Size: 2"
Purity: n/a