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AR-SE-NIC 
Even though the element has been known for centuries, credit for the discovery was given to Albertos Magnus. There are two forms of arsenic that you might encounter in chemistry. There is a yellow form and a gray form that most people are familiar with. The gray form is semi-metallic (you might see the term metalloid) and has physical traits that are crystalline and brittle. Most people think of poison when they think of the element arsenic. When present in high concentrations, arsenic can kill you instantly. When arsenic is present in very small amounts (soils or water supply), it can kill and poison you over many years. Arsenic is found in the fourth period/row of the table of elements. It is a member of the phosphorus family with other elements including phosphorus (duh), antimony (Sb), and bismuth (Bi).
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