Helium (He)

Atomic Number: 2

Relative Atomic Mass: 4.0026022

Electronegativity: Unknown


Atomic Radius (Picometers): Unknown


Appearance: Colourless (Purple when subject to a high voltage electric field)

Occurrence: Natural


Melting Point (Kelvin): 0.95

Boiling Point (Kelvin): 4.22

Stable Isotopes: 3, 4


Discoverer: Sir William Ramsay in 1895

Properties: Found Only in Monotomic Form, Low Density, Low Solubility, Inert

First Use: Balloons (World War One), Airships (1921)

Modern Uses: Industry and Scientific 

Picture Courtesy of Alchemist-hp


©2011 Grant Dwyer