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Period 4 element
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===Zinc=== [[File:Zinc fragment sublimed and 1cm3 cube.jpg|frameless|left|upright=0.3]] [[Zinc]] (Zn) is an element in [[group 12 element|group 12]]. Zinc is one of the main components of [[brass]], being used since the 10th century BCE. Zinc is also incredibly important to humans; almost 2 billion people in the world suffer from zinc deficiency. However, too much zinc can cause copper deficiency. Zinc is often used in batteries, aptly named [[carbon-zinc batteries]], and is important in many platings, as zinc is very corrosion resistant.
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