Metalloids are

Metalloids are a distinct category of chemical elements that possess properties intermediate between those of metals and non-metals [1]. Physically, they often appear as shiny, brittle solids, but they behave chemically more like non-metals [1]. Their electrical conductivity is typically intermediate, which allows them to function as semiconductors, a property that can be enhanced through doping for use in electronic components like transistors. On the periodic table, metalloids are found along a zig-zag line that separates metals from non-metals. Common examples include boron, silicon, germanium, arsenic, antimony, and tellurium. While alloys of mercury are specifically called amalgams and alloys of alkali metals are distinct metallic mixtures, metalloids are unique natural elements defined by their dual metallic and non-metallic characteristics.

Sources

1. [1] https://en.wikipedia.org/wiki/Metalloid