Which category includes elements like silicon and has semiconducting properties?

• A. Metals
• B. Nonmetals
• C. Halogens
• D. Metalloids

Answer: (D)

Semiconducting behavior is a hallmark of metalloids. Silicon sits in a region of the periodic table where elements have properties between metals and nonmetals. These elements conduct electricity moderately and in a controllable way, especially when they are doped with impurities or exposed to light or heat. That controllable conductivity is what makes silicon so valuable for electronics. Metals conduct electricity very well and are typically shiny and malleable, while nonmetals (including halogens) are generally poor conductors. Metalloids like silicon blend those behaviors, giving them intermediate conductivity and the ability to be precisely controlled, which is why this category includes silicon and is characterized by semiconducting properties.