Name two non metals which are good conductors of electricity ???
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Water with a high salt concentration, and plasma (electrically charged gas)
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Wood.  Wood is an insulator.  The other materials conduct electricity.
400180
Metals conduct because they have free electrons, free in the sense free from the bonding to the atom.\n\nSemi conductors do not have free electrons. They are insulators near absolute temperature. But when temperature is raised some of the electrons are freed and become conductors. \n\nAdding (doping) trivalent (three valence electrons) atoms produce P type semi conductors.\n\n By this addition we have not made any free electrons. Thus still the semiconductor can free electrons only when temperature is raised.\n\nBut since the doped atom has only three electrons, the semiconductor’s bonds are complete only when one more electron is added to every doped atom.\n\nThus the P type semiconductor is always in need of one electron per impurity atom.\n\nWe say that a ‘hole’ is there to accept an electron. The number of holes is equal to the number of trivalent atom added. \n\nThese holes are free to move from atom to atom like electrons in metals.\n\nHence P type semi conductor conducts current by the movement of holes.
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Metals, Nonmetals, & Metalloids\n\nMost periodic tables contain a stairstep line which allows you to identify which elements are metals, nonmetals, and metalloids. Following are descriptions of each of the three types of materials.\n\nMetals\n\nMost elements are metals. 88 elements to the left of the stairstep line are metals or metal like elements.\n\nPhysical Properties of Metals:\n\nLuster (shininess) \nGood conductors of heat and electricity \nHigh density (heavy for their size) \nHigh melting point \nDuctile (most metals can be drawn out into thin wires) \nMalleable (most metals can be hammered into thin sheets) \nChemical Properties of Metals:\n\nEasily lose electrons \nCorrode easily. Corrosion is a gradual wearing away. (Example: silver tarnishing and iron rusting) \nNonmetals\n\nNonmetals are found to the right of the stairstep line. Their characteristics are opposite those of metals.\n\nPhysical Properties of Nonmetals:\n\nNo luster (dull appearance) \nPoor conductor of heat and electricity \nBrittle (breaks easily) \nNot ductile \nNot malleable \nLow density \nLow melting point \nChemical Properties of Nonmetals:\n\nTend to gain electrons \nSince metals tend to lose electrons and nonmetals tend to gain electrons, metals and nonmetals like to form compounds with each other. These compounds are called ionic compounds. When two or more nonmetals bond with each other, they form a covalent compound.\n\nMetalloids\n\nElements on both sides of the zigzag line have properties of both metals and nonmetals. These elements are called metalloids.\n\nPhysical Properties of Metalloids:\n\nSolids \nCan be shiny or dull \nDuctile \nMalleable \nConduct heat and electricity better than nonmetals but not as well as metals
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Pure water, H2O is a terrible conductor of electricity, however, water that has hard water deposits and other impurities in it is a great conductor
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The atomic bonds in sugar are very tight and do not allow for (measurable) ionization, which is what helps water conduct electricity.  Salt (NaCl) is a powerful ionization agent - the Cl atom "steals" Na's outer electron, forming a Na+ ion, which attracts new electrons introduced into the water.  We call that a conductor!
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There are many types but all work on the principle that different semiconductors (i.e conducts electricity under certain conditions) placed together can turn on larger currents in another circuit.\nThe metals usually used are Germanium, Gallium, Asenide or compound of these including Silicon and Aluminium.\nYou might want to look at http://en.wikipedia.org/wiki/Transistor for more detailed info.
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Less dense materials are better insulators. The denser the material, the closer its atoms are together. That means the transfer of energy of one atom to the next is more effective. Thus, gases insulate better than liquids, which in turn insulate better than solids.\n\nAn interesting fact is that poor conductors of electricity are also poor heat conductors. Wood is a much better insulator than copper. The reason is that metals that conduct electricity allow free electrons to roam through the material. This enhances the transfer of energy from one area to another in the metal. Without this ability, the material--like wood..AND IN YOUR CASE RUBBER--does not conduct heat well.
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Chemically pure water is an electrical insulator.\n\nEven the least impurity, even the least amount of any dissolved ion, will convert it into a conductor.  Even dissolved CO2 will provide the ionic activity to make water conductive
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Copper is a pure metal. The conductivity of metals increase with temparature owing to decrease in the vibration of the +ve ions in the crystal lattice. Germanium is a semiconductor. Its conductivity decreases with temparature. Hence copper has more conductivity than Ge at low temps.
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Copper. It is so brilliant
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Mercury has a Rhombohedral crystal structure, which means that it is close packed.  The close packed structure of the mercury will have a greater efficiency in conducting electricity compared metals such as alkaline earth metals which are packed less efficiently having 8-co-ordinated structure.  The reason why it can conduct electricity well is because it is a metal containing atoms with relatively large numbers of free electrons and it is efficiently packed.  With such structure, the electrons flow from one atom to another when electrical field is passed through quite well.  Although it is not considered to be an ideal electrical conductor, Mercury is a fairly good conductor with electrical conductivity of 10.163 1/mohm-cm.
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yes they do.  Metals, metallic solutions,melts of metals, metallic films, metallic coatings conduct electricity.(They are metals)
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No, copper is NOT cheap, it costs quite a bit more than aluminum pound for pound. Copper has a much lower resistance to electricity than aluminum does. When subjected to the loads household wiring have to deal with, aluminum wiring would have to be prohibitively thick to prevent overheating. Copper provides the best conductivity with the best compactness for the best price.
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actually none of those make good insulators, they are all a type of metal or combination there of. if anything they are all conductors, not insulators. if you need a good insulator glass, or porcelain, for PVC and i guess it also depends on what you are trying to insulate but those choices are not good for insulating anything.
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Traditionally, metals have certain characteristic physical properties: they are usually shiny (they have "lustre"), have a high density, are ductile and malleable, usually have a high melting point, are usually hard, and conduct electricity and heat well. However this is mainly because the low density, soft, low melting point metals happen to be reactive, and we rarely encounter them in their elemental, metallic form. Metals are also sonorous, which means that they conduct sound well.\n\nAnd not all metals are magnetic!\n\nPalladium is a soft silver-white metal that resembles platinum. It doesn't tarnish in air. Palladium is the least dense and has the lowest melting point of the platinum group metals. It is soft and ductile when annealed and greatly increases its strength and hardness when it is cold-worked. Palladium is chemically attacked by sulfuric and nitric acid but dissolves slowly in hydrochloric acid. This metal also does not react with oxygen at normal temperatures.
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use a potato and two different metals as electrodes. The link will help you, do your own homework, or web searching atleast! it was the second link in google for g** sake!