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     Note : - Non metals are bad conductors of electricity except carbon
        which is a good conductor of electricity .
        Metals are solids except mercury which is liquid .
        The the economic importance  (life applications):
        Metals
        Iron is used in making: Bridges, car frames, doors and street lights
        (lamp posts).
        Aluminum is used in making:
        Cooking pots and  foil paper.
        Copper is used in making:
        Statues, coins and electric wires.
        Gold is used in manufacturing (making) Jewels.
        Non Metals
        Carbon (graphite) is used in making:
        Positive poles of dry cells (batteries).
        Element                                Kind               Importance
        1- Iron                                Metal              Bridges and car frames
        2- Aluminum                            Metal              Cooking pots
                                                                  foil paper
                                                                  Electric wires
        3- Copper                              Metal              Statues
                                                                  metallic coins
        4- Gold and Silver                     Metal              Jewellery
        5- Carbon (graphite)                   Non-metal  positive poles of dry cells
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