Final answer:
Most nonmagnetic tools are made from the Beryllium-copper alloy because it does not exhibit ferromagnetic properties and does not become magnetized like the metals iron, cobalt, and nickel.
Step-by-step explanation:
The alloy used to make most nonmagnetic tools is Beryllium-copper. This is because magnetic properties are primarily associated with three main metals: iron, cobalt, and nickel, which are considered ferromagnetic materials. Beryllium-copper is preferred for nonmagnetic tool creation as neither beryllium nor copper is ferromagnetic, and the alloy does not become magnetized under normal conditions. As for cadmium and nickel-iron, cadmium is toxic and would not make a suitable material for tools, while nickel-iron is indeed a ferromagnetic material and thus not ideal for nonmagnetic tool applications.