Brent,+Willie

​ The atomic number of arsenic is 33, and the atomic mass of arsenic is 74.9216. Arsenic is a solid and a metalloid. Arsenic was discovered by Albertus Magnus. He heated a common compound of Arsenic which is opiment with soap. Arsenic occurs in two allotropic forms. Allotropes are forms of an element with different physical and chemical properties. The more common form of arsenic is a shiny, gray, brittle, metallic looking solid. The less common form is a yellow crystalline solid which is produced when vapors of arsenic are cooled suddenly. When heated arsenic does not melt as most solids do. Instead it changes directly into a vapor(gas). This process is known as sublimation. However when when under high pressure arsenic can be forced to melt at about 814 degrees celcius or (1500 degrees farenheit) Arsenic is a metalloid which is an element that has properties of both metals and nonmetals. Arsenic rarley occurs as a pure element,but is usually found as a compound.Arsenic is known as a poison and it is used in bug, and rat poisons. It is highly toxic to humans and can cause cancer when it comes in contact with humans. If ingested in small amounts overtime, it will produce the symptoms of pneumonia. Besides poison arsenic has other common uses like in things like plants, wallpapers, shotgun pellets, morrors, semiconductors, laundry detergent, tobacco smoke, sea food, and beer. The symptoms of arsenic poisoning begin with headaches confusion and drowsiness. The organs it affects is the lungs, skin, kidneys, and liver.