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Lead Final
 

Lead Final

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    Lead Final Lead Final Presentation Transcript

    • By: Peter Zalewski
      • Lead is an element with the atomic number 82, is in Group 14, Period 6 and is a metal. Lead is a soft, malleable metal considered to be one of the heavy metals. Lead has a bluish-white color when freshly cut, but turns to a dull greyish color when exposed to air.
      • It’s used in building construction, lead-acid batteries, bullets, weights, and is part of solder and radiation shields.
      • Lead has the highest atomic number of all stable elements.
      • Lead is a poisonous metal that can damage nervous connections (especially in young children) and cause blood and brain disorders.
      • http://www.niehs.nih.gov/health/topics/agents/lead/
    • Video Clip
      • In the Earth's crust, lead is rarely found as a pure metal, but rather as lead compounds such as lead sulfide, lead sulfate or lead oxide. These lead compounds often occur with silver.
      • Lead has no role in the human body and is quite toxic. In the 1970s, many American children suffered from lead poisoning through exposure to lead paints. Such paints are no longer produced in the United States.
      • The incidence of lead exposure through this source has gone down, except in older houses.
      • http://environmentalchemistry.com/yogi/periodic/Pb.html
      • Boiling Point: 1740°C
      • Melting Point: 327.6°C
      • Packing Structure: Cubic - face centered
      • http:// www.webelements.com/lead/crystal_structure_pdb.html
      • Space group: Fm-3m (Space group number: 225)
      • Cell parameters:
        • a : 495.08 pm
        • b : 495.08 pm
        • c : 495.08 pm
        • α: 90.000°
        • β: 90.000°
        • γ: 90.000°
      • Atomic Mass: 207.2
      • Flammability Class: Non-combustible solid (except as dust)
      • Discoverer: Known to ancient civilization
      • Electron Configuration:
      • 1s 2 2s 2 p 6 3s 2 p 6 d 10 4s 2 p 6 d 10 f 14 5s 2 p 6 d 10 6s 2 p 2
      • Ionization Potential
        • *First: 7.416 * Second: 15.028 * Third: 31.943
      • Electronegativity: 2.33 (Pauling)
      • Molar Volume: 18.27 cm 3 /mole
      • Abundance of Lead in Earth's Crust /p.p.m.: 14
      • http://www.webelements.com/lead/
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    • World wide production of lead is around 2,800,000 tons per year. Primary mining areas are in USA, Australia, Mexico, Germany and France.
      • The exhibit “Lead is the heaviest element right?” is meant to allow the visitor to find out for him/herself if lead is actually the heaviest.
      • The exhibit has 3 different blocks the visitor can lift; lead, uranium and aluminum.
      • It shows that even though stereotypically lead is thought to be the heaviest, uranium is actually much heavier.
    •