What is an alloy of mercury with another metal?

An alloy of mercury with another metal is called an amalgam. This term specifically refers to the mixture formed when mercury is combined with other metals, resulting in a material that retains unique properties distinct from those of the individual metals. Amalgams are commonly used in dental fillings due to their durability and ability to bond with tooth structure.

Other options, such as alloy, brass, and bronze, describe different types of metal mixtures. An alloy is a general term for any mixture of metals, while brass and bronze are specific alloys made primarily of copper and tin, respectively, with no mercury involved. Therefore, amalgam is the precise term needed to identify a mercury alloy, making it the correct answer in this context.