Iodine (I)

Atomic Number: 53

Relative Atomic Mass: 126.90447

Electronegativity: 2.66

Atomic Radius (Picometers): 140

Appearance: Grey (Violet when Gas)

Occurrence: Natural

Melting Point (Kelvin): 386.85

Boiling Point (Kelvin): 457.4

Stable Isotopes: 127

Discoverer: Bernard Courtois in 1811

Properties: Low Toxicity, Irritating Odor

First Use: Unknown

Modern Uses: Medical, Water Treatment

Picture Courtesy of Tomihahndorf

©2011 Grant Dwyer