Metaloid
Metaloid is a series of chemical elements that have properties between metals and non-metals. Metaloids are difficult to distinguish by metal, the main difference is generally the metaloid is semi-conductor while the metal is conductor. There are 7 elements that are grouped as metaloids: boron, silicon, germanium, arsenic, antimony, telurium, polonium, and astatin. In the future; periodically, the metalloid forming diagonal line from boron to polonium. The elements on the upper right of this line are non-metallic while the bottom left is metal.