Lead


 * Lead (Pb) **b y : L i n H u a n g

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This element was discovered in ancient times, and was known to the Mesopotamians, Egyptian, Greeks and the Romans. First uses of lead were around 3500 B.C.
 * Who discovered this? **
 * When was it discovered? **


 * Symbol: ** Pb
 * Origin of the symbol: ** Came from the Latin word for waterwork- Plumbum.
 * Atomic number ** **:** 82
 * Atomic mass: ** 207.02




 * Number of protons: ** 82
 * Number of neutrons: ** 125
 * Number of electrons: ** 82




 * Where is it found: ** Land
 * State of matter: ** Solid.


 * Melting point: ** 327.46 C
 * Boling point: ** 1749 C
 * Density: ** 11.34 g/cm3
 * Abundance in the Earth’s crust: ** 1.4×101 milligrams per kilogram

-The metal is very effective as a sound absorber, is used as a radiation shield around X-ray equipment and nuclear reactors, and is used to absorb vibration. -Commonly used in a car battery. -Due to its low melting point and cost, lead is used as projectiles for fishing sinkers and firearms. -Lead, in the form of strips or tape is used in the manufacturing of tennis racquets to increase its weight.
 * Uses: **

-Lead is toxic. -Lead has long been recognized as a harmful environmental pollutant. -Alchemists believed lead to be the oldest metal. It was associated with the planet Saturn.
 * Interesting facts: **

- Lead is classified in the "other metals" section which can be located in groups 13, 14, and 15 of the Periodic table.

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 * Sources: **