Semimetals, also known as metalloids, are a unique group of elements that exhibit properties of both metals and nonmetals. At room temperature, they are generally solid.

Here's why:

* Metallic properties: Semimetals have a shiny, metallic appearance and can conduct electricity, albeit not as well as true metals.

* Non-metallic properties: They are brittle, meaning they can be easily broken, and they have a limited ability to conduct heat.

Here are some examples of semimetals and their states at room temperature:

* Boron (B): Solid

* Silicon (Si): Solid

* Germanium (Ge): Solid

* Arsenic (As): Solid

* Antimony (Sb): Solid

* Tellurium (Te): Solid

* Polonium (Po): Solid

It's important to note that the properties of semimetals can vary slightly depending on the specific element. However, they are all solids at room temperature.