Hydrogen (H)

Atomic Number: 1


Relative Atomic Mass: 1.007947


Electronegativity: 2.20


Atomic Radius (Picometers): 25


Appearance: Colourless Gas (Purple in Plasma State)


Occurrence: Natural


Melting Point (Kelvin): 14.01


Boiling Point (Kelvin): 20.28


Stable Isotopes: 1, 2


Discoverer: Henry Cavendish in 1766 (Robert Boyle prepared it in 1671 but Cavendish was given 
                     credit for recognising it's nature)


Properties: Found only in Diatomic Form unless dissolved, Low Density


First Use: Balloons (1783), Airships (1852)   


Modern Uses: Renewable Fuel with Oxygen, Haber Process

Picture Courtesy of Alchemist-hp


©2011 Grant Dwyer