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A metalloid is any chemical element which has properties in between those of metals and nonmetals, or that has a mixture of them.
Metalloids from the periodic table
The six commonly recognised metalloids are boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), and tellurium (Te). Antimony is sometimes classified as metal. In older literature, five other elements were also considered metalloids: carbon, aluminium, selenium, polonium, and astatine.
Metalloids are all solids, and with the exception of boron, which is black, all are silvery-gray in color. They have low reactivity, though arsenic is toxic. Metalloids are brittle and only fair conductors of electricity.