Which of the following is a characteristic of metals?

Metals are known for their malleability, which means they can be easily shaped or deformed without breaking. This property arises from the metallic bond structure, where the metal atoms can slide past one another while maintaining the overall integrity of the material. Malleability allows metals to be hammered into thin sheets or drawn into wires, making them versatile for various applications in construction, manufacturing, and more.

In contrast, the other options do not generally describe metals. For example, while certain metals can be solid or liquid at room temperature, they are certainly not gaseous under standard conditions, ruling out that option. Additionally, metals typically have high solubility in certain solvents and high electrical and thermal conductivity, meaning that they are usually not nonconductive. Malleability stands out as a definitive characteristic of metals, showcasing their ability to retain strength and integrity while being manipulated.