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electrical conductivity is for electricity to go through an object

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A pure substance is only one type of particle

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thermal conductivity means that the object have heat on it

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metals are shiny an conduct electric current and heat conduction

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the object is bright when their is derrect light

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metalloids are a combination of both nonmetals and metals

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nonmetals don't conduct heat or electric currents and are dull in appearance

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an element is a pure pure substance that cannot be separated