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A semimetal or a metalloid is a chemical element. It has some properties like a metal. Some properties are like a nonmetal. It might be shiny, but brittle. It might be dull, but conducts electricity. It might be very hard, but shiny. The most common semimetal is silicon. Silicon has electrical conductivity between metals and nonmetals. It is a semiconductor.

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Polonium and astatine are semimetals, but they are radioactive and almost impossible and very dangerous to get.