Friday, October 23, 2009

Lead Pb

Lead Pb | 82

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Caution! Lead Ahead

Lead in my bread?

Lead is thought to have been discovered and known by the ancient Romans. An exact date of discovery is unknown, although some sources believe it was in use before 6500 B.C. Supposedly, it was used to sweeten wine and much of the Roman diet as well as an aid in plumbing construction. The name originates from the Greek word protos (first) while the symbol is derived from the Latin word plumbum (lead). Lead is known as a “poor malleable (very soft) metal” with the symbol “Pb” and the atomic number of 82, placing it as the highest of all stable elements. According to most sources, it has a bluish-silver color when freshly cut that turns a dull gray when exposed to air and gives a chrome-silver luster in liquid form. It can be found in ore with zinc, silver and copper. Finding active lead is rare, however, the most common found lead form is known as galena.

Having a number of various uses, lead is seen in construction, batteries, weights, solder, shielding radiation, ammunition and, in some cases, gasoline. It also creates many valuable compounds such as those used in printing and painting. It is the end product of radioactive decay. As seen with lead poisoning, all forms of lead and its compounds are toxic (especially to children due to their rapid metabolism, smaller mass and habits). Health concerns and lead pollution are usually due to human activities and processes (e.g. exhausts on cars). In addition to this, lead can be dangerous and found in almost anything such as water, meats, grains, fruits, vegetables and soda to name a few.

Phase at Room Temperature: Solid

Element Classification: Metal

Melting point: 327. 6 C

Boiling Point 1740 C

Density 11.35g/cc @300K

Electrons: 82

Neutrons: 125

Atomic Number: 82

Atomic Mass: 207.2 amu

Crystal Structure: Cubic

Group: 14

Period: 6

Lustre: Metallic

Transparency: Opaque

Color: Grey—coated with white Hydrocerrusite

Hardness1 ½

Tenacity: Mallealble

Fracture: Hackly­­

Electron Configuration: 1s2 2s2p6 3s2p6d10 4s2p6d10f14 5s2p6d10 6s2p2

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