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    LEAD
    82
    Pb
    207.2 (1) g m


    Name: leadGroup number: 14
    Symbol: PbGroup name: (none)
    Atomic number: 82Period number: 6
    Atomic weight: 207.2 (1) g mBlock: p-block
    CAS Registry ID: 7439-92-1Voice:
    Standard state: solid at 298 KColour: bluish white
    Classification: MetallicAvailability:

    lead bar in Cluedo

    Lead is a bluish-white lustrous metal. It is very soft, highly malleable, ductile, and a relatively poor conductor of electricity. It is very resistant to corrosion but tarnishes upon exposure to air. Lead pipes bearing the insignia of Roman emperors, used as drains from the baths, are still in service. Alloys include pewter and solder. Tetraethyl lead (PbEt4) is still used in some grades of petrol (gasoline) but is being phased out on environmental grounds.

    Lead isotopes are the end products of each of the three series of naturally occurring radioactive elements.

    Nearing Zero cartoon for lead
    Nearing Zero cartoon included by kind permission of Nick Kim.

    Isolation

    Here is a brief summary of the isolation of lead.

    There is usually little need to make lead metal in the laboratory as it is so cheap and readily available. Lead is isolated from the sulphide, PbS. The process involves burning in a restricted air flow followed by reduction of the resulting oxide PbO with carbon.

    PbS + 3/2O2 PbO + SO2

    PbO + C Pb + CO

    PbO + CO Pb + CO2

    This gives lead usually contaminated with metals such as antimony, arsenic, copper, gold, silver, tin, and zinc. A fairly complex process is used to strip out these impurities.

    Fluorides
  • PbF2
  • PbF4
  • Chlorides
  • PbCl2
  • PbCl4
  • Bromides
  • PbBr2
  • PbBr4
  • Iodides
  • PbI2
  • Hydrides
  • PbH4
  • Oxides
  • PbO
  • PbO2
  • Pb2O3
  • Pb3O4
  • Sulfides
  • PbS
  • Selenides
  • PbSe
  • Tellurides
  • PbTe
  • Nitrides
    none listed






    Our data and resources are taken from Web Elements