Arsenic

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 * === Arsenic ===
 * === Who discovered Arsenic? ===
 * 1) === Arsenic was discovered by Albertus Magnus. ===
 * === When was it discovered? ===
 * 1) === It was discovered in 1250. ===
 * === Symbolm, Atomic Number and Atom Mass. ===
 * 1) === symbol: As. ===
 * 2) === Atomic number: 33 ===
 * 3) === Atomic Mass: 74.9216amu (atomic mass number). ===
 * === Number of protons neutrons and electorn. ===
 * 1) === Protons: 33. ===
 * 2) === Neutrons: 42. ===
 * 3) === Elecrtons: 33. ===
 * === Where it is found( air, water, and land) and in what shape. ===
 * 1) === Arsenic is foundin the natural environment in some abundance in the Earth's crust in small quantities in rock, soil, water and air. ===
 * === Physical facts: ===
 * 1) === Melting point 817.0°C (1090.15Km 1502.6°F) ===
 * 2) === Boiling point 613.0°C(886.15K, 1135.4°F) ===
 * 3) === Density @ 293 K: 5.72 g/cm3 ===
 * 4) === Abundance in the Earths curst (cryst includes air, water, land) ===
 * === U se (how element is used). ===
 * 1) === Up to 2% of Arsenic is used in lead alloys for lead shorts and bullets. ===
 * 2) === Aresenic is also used for taxonomic sample preservation. ===
 * 3) === Is also used in optical glass. ===
 * === Fact ===
 * 1) === Arsenic is a poisonous substance, which is released both from certain human activities and naturally from the Earth's crust. ===
 * === Sources ===
 * 1) === Sources of arsenic include: contaminated foods (especially seafood), water or medications. Industrial sources are: ore smelting/refining/processing plants, galvanizing, etching and plating processes. ===
 * 2) === Tailings form or river bottoms near gold mining areas (past or present) may contain arsenic. ===
 * 3) === Insecticides and fungicides (Na-, K- arsenates, arsenates, also oxides are aommerically available). ===
 * 4) === Commercial arsenic produsts include: sodium arsenate, calcium arsenate, lead arsenate and "Paris green" (cupric acetoarsenite) a wood preservative. ===