Lead

**Lead** = = By: Crystal

** Atomic Number: **82

** Protons: ** 82


 * Electrons: **82

**
 * Neutrons: 127
 * Average Atomic Mass: 207.2 **


 * Isotopes: Pb-204, Pb-206, Pb-207, Pb-208 **


 * Discovery: Lead has been around for thousands of years, but it is impossible to say when it was first discovered. **


 * Name: ** No one is quite sure how lead got its name. The word has been traced to manuscripts that date to before the 12th century. Romans called the metal plumbum. That is how the element's chemical symbol is: Pb.

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 * Uses:  Lead can be used as a pure metal, alloyed with other metals, or as a chemical compound. Some other uses of lead include the making of leaded bronze ornaments, toys, lead weights and coffins. Lead in the form of strips or tape is used in the manufacturing of tennis racquets to increase its weight. Lead is also used in pencils.
 * Interesting Facts ** : Lead is soft, malleable, ductile, and a dense metallic element. Alchemists thought lead was probably the oldest known element. People have recognized that the metal is poisonous for thousands of years and we still use it.

media type="youtube" key="2ERfPN5JLX8" height="364" width="445" **
 * Video:

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 * Sources **
 * ** Photo: http://cltad.arts.ac.uk/groups/camberwellmateriallibrary/wiki/f347a/images/5bd87.jpg **
 * ** Video: http://www.youtube.com/watch?v=2ERfPN5JLX8 **
 * http://www.ornl.gov/sci/isotopes/s_pb.html
 * http://www.chemistryexplained.com/elements/L-P/Lead.html
 * http://www.buzzle.com/articles/uses-of-lead.html
 * http://www.webelements.com/lead/
 * http://www.niehs.nih.gov/health/topics/agents/lead/