Final answer:
Metalloids are elements with properties between metals and nonmetals, including boron, silicon, germanium, arsenic, antimony, and tellurium, known for their semiconductor properties.
Step-by-step explanation:
The metalloids are a category of elements found on the periodic table that display properties between those of metals and nonmetals. They include boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), and tellurium (Te). These elements often look metallic, but they do not conduct electricity as well as metals, making them useful semiconductors. Their chemical behavior exhibits characteristics of both metals and nonmetals, such as forming covalent crystals like nonmetals but not readily forming monatomic anions like metals.