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Period 5 element
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===Antimony=== {{main|Antimony}} '''Antimony''' ({{langx|la|stibium}}) is a toxic [[chemical element]] with the symbol '''Sb''' and an [[atomic number]] of 51. A lustrous grey [[metalloid]], it is found in nature mainly as the [[sulfide mineral]] [[stibnite]] (Sb<sub>2</sub>S<sub>3</sub>). Antimony compounds have been known since ancient times and were used for cosmetics, metallic antimony was also known but mostly identified as [[lead]]. For some time China has been the largest producer of antimony and its compounds, with most production coming from the [[Xikuangshan Mine]] in [[Hunan]]. Antimony compounds are prominent additives for chlorine and bromine containing [[fire retardant]]s found in many commercial and domestic products. The largest application for metallic antimony is as alloying material for lead and tin. It improves the properties of the alloys which are used as in [[solder]]s, bullets and [[ball bearing]]s. An emerging application is the use of antimony in [[microelectronics]].
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