Key information
Atomic number: 
82
Atomic weight: 
207.19
Density: 
11400 kg/m³
Boiling point: 
1998.16° K
Melting point: 
600.56° K
Heat vapour: 
176.72 kJ/mol
Heat fusion: 
5.11 kJ/mol
Thermal conductivity: 
4.6 W/m/K
Specific heat capacity: 
34.76 J/kg/K

Lead is a relatively poor conductor of electricity; it is highly resistant to corrosion, but tarnishes on contact with air. Isotopes of lead are the end product of decay in each of three series of naturally occurring radioactive elements.

John Dalton (1766-1844) Symbol for LeadJohn Dalton (1766-1844) in A New System of Chemical Philosophy, published in 1808, revived the atomic theory of matter, adding to it the key idea that different elements had different characteristic atomic weights. He also proposed a system of arbitrary marks for several elements, thus moving on from the alchemical / chemical symbols of Karl Wilhelm Scheele (1742-1786). Lead is represented by the letter L inside a circle.

Electron Shell: 
Amazon Books
Image of The Last Sorcerers: The Path from Alchemy to the Periodic Table
Author: National Academy of Sciences, Richard Morris
Publisher: Henry (Joseph) Press (2003)
Binding: Hardcover, 294 pages