Final answer:
A semiconductor commonly used in electronics is classified as a metalloid, which has intermediate properties between metals and nonmetals, with silicon and germanium being prime examples.
Step-by-step explanation:
Semiconductor Element in Electronics
An element that is a semiconductor and commonly used in electronics such as computers and cell phones would be classified as a metalloid. Metalloids are elements with properties that are intermediate between those of metals and nonmetals. Silicon and germanium are examples of metalloids that are extensively used in electronics due to their ability to conduct electricity better than nonmetals but not as well as metals, which makes them ideal for use in transistors and other solid-state devices.
Therefore, the correct answer to the question is C. Metalloid.