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Alkaline battery

Alkaline battery is the most common single-use (primary) battery, got its name so because it uses a paste of KOH as the electrolyte. Alkaline earth metals.

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Heavy metals

Heavy metal is a term used to describe a subset of a large number of metals and metalloids with high atomic(such as chromium, cadmium, arsenic and mercury), listed in the periodic table of the elements, which have properties of both metals and non-metals.