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Metalloids, also known as semimetals are elements containing properties midway between metals and nonmetals. This is a list of the metalloid elements.
Nonmetals. Metalloids. Silicon for example appears lustrous, but is not malleable or ductile (it is brittle-a characteristic of some nonmetals). It is a much poorer conductor of heat and electricity than the metals. Metalloids are useful in the semiconductor industry.onmetals. Metalloids. Silicon for example appears lustrous, but is not malleable or ductile (it is brittle-a characteristic of some nonmetals). It is a much poorer conductor of heat and electricity than the metals. Metalloids are useful in the semiconductor industry.