Arsenic is a semi metal that is used in semiconductors and also in lead batteries for cars. Whilst Silicon is the most common semiconductor arsenic is also commonly used due to its ability to conduct a current. Arsenic also has a use in pesticides however it is a very toxic compound to biological organisms. Until recently it was thought to be dangerous to living organisms but a number of bacteria have recently been discovered that uses arsenic in their metabolism. Arsenic was isolated by Jabir Ibn Hayyan in 815 AD but was first prepared by Johann Schoder who wrote a paper on two ways to isolate arsenic crystals. In Victorian times arsenic was mixed with vinegar and chalk and eaten by women to improve their complexion however it was proved to be a poison. It is located in Group 15 and it has a melting point of 817°c and a boiling point of 613°c being a solid at room temperature.
Known to the ancients & Albertus Magnus