Metalloids, which include elements such as silicon, germanium, arsenic, and antimony, are typically in a solid state at room temperature. This characteristic sets them apart from most metals and nonmetals, which can be found in different physical states at this temperature.
The solid state of metalloids can be attributed to their unique atomic structure and the nature of their bonding. Metalloids usually exhibit properties that are intermediate between metals and nonmetals, allowing them to maintain a solid form while still demonstrating some metallic and non-metallic characteristics.