Potassium (K)

Atomic Number: 19

Relative Atomic Mass: 39.09831

Electronegativity: 0.82


Atomic Radius (Picometers): 220


Appearance: Silvery-Grey

Occurrence: Natural


Melting Point (Kelvin): 336.53 

Boiling Point (Kelvin): 1032

Stable Isotopes: 39, 41


Discoverer: Sir Humphry Davy in 1808

Properties: Very Reactive with Water, Soft

First Use: Clothing (Middle Ages)

Modern Uses: Fertiliser, Food

Picture Courtesy of images-of-elements.com

©2011 Grant Dwyer