Calcium (Ca)

Atomic Number: 20

Relative Atomic Mass: 40.0784

Electronegativity: 1.00


Atomic Radius (Picometers): 180


Appearance: Dull Grey

Occurrence: Natural


Melting Point (Kelvin): 1115

Boiling Point (Kelvin): 1757

Stable Isotopes: 40, 42, 43, 44


Discoverer: Sir Humphry Davy in 1808

Properties: Soft, Good Electrical Conductor

First Use: Medicine (975)

Modern Uses: Making Acetylene Gas, X-ray Studies

Picture Courtesy of Matthias Zepper


©2011 Grant Dwyer