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Arsenic: Metals
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Arsenic is a crystal-shape metalloid element, which is brittle in nature, and gray or tin-white in colour. Arsenic is a Group-V element in the periodic chart . Its atomic number is 33, and the atomic weight is 74.92.
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Arsenic is an extremely poisonous semimetallic element. It is believed that Albertus Magnus obtained the element in 1250 A.D. Elemental arsenic occurs in two solid forms: gray, metallic in appearance, with a specific gravity of 5.7 and yellow, nonmetallic, with a specific gravity of 2.0.
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Arsenic is used as an additive for metallurgical purposes due to its semi-metallic properties. Examples include: adding 2% to lead to produce lead shot where the addition increases sphericity; a 3% addition to lead alloys increases mechanical properties and high temperature properties; and 0.15-0.50% addition to copper for high temperature applications.
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