"Metalloid" Natural Recordings by Native Speakers
A metalloid is a chemical element that exhibits some properties of metals and some properties of nonmetals. Metalloids typically have a few different electrons in their outermost energy level, which allows them to form bonds with other atoms in a way that is similar to metals, but they also exhibit some nonmetallic properties, such as being semiconductors and having a higher atomic mass than metals. Examples of metalloids include silicon, germanium, arsenic, and antimony.
Metallograph is a noun that refers to the study of the microscopic structure of metals and alloys.