At room temperature, KCl is a metal (solid).
There is no gaseous phase in ionic compounds at room temperature and pressure.
Potassium is a solid at room temperature and pressure, so it is in its solid phase. It has a metallic appearance and is a soft, silvery-white alkali metal.
Potassium at room temperature is a solid.
At standard temperature and pressure, potassium is a solid.
Potassium chloride is a white crystalline solid at room temperature.
At room temperature (~25°C), germanium is in the solid crystalline phase.
Hydrogen is typically in the gas phase at room temperature and atmospheric pressure.
Gas at room temperature
Iodine is a solid at room temperature.
Copper is a solid at room temperature.
Potassium is in thee solid state at standard temperature and pressure, which is sometimes loosely called "room temperature".