Gold (Au) has both malleability and ductility properties. The elements which tend to form positive ions are called metals. They are luster, ductile, malleable, a good conductor of heat and electricity, and high melting and boiling points. Metals are also solid at room temperature except for mercury. They have high tensile strength. They are usually hard, except sodium, potassium. They act as reducing agents. They displace hydrogen from acids. They react with water to evolve hydrogen gas.