Arsenic (As)

Atomic Number: 33

Relative Atomic Mass: 74.921602

Electronegativity: 2.18

Atomic Radius (Picometers): 115

Appearance: Metallic Grey

Occurrence: Natural

Sublimation Point (Kelvin): 887

Stable Isotopes: 75

Discoverer: Albertus Magnus in 1250

Properties: Brittle, Toxic

First Use: Bronze (2500 BC)

Modern Uses: Alloys, Medicine

Picture Courtesy of Tomihahndorf

©2011 Grant Dwyer