Which one among the following metals is not a ferromagnetic material?

Ferromagnetism is a physical phenomenon in which certain materials exhibit strong attraction to magnetic fields and can retain their magnetization to become permanent magnets. The most common examples of ferromagnetic elements at room temperature are Iron (Fe), Cobalt (Co), and Nickel (Ni). These materials have unpaired electrons whose magnetic moments align parallel to each other even in the absence of an external field.

Silver (Ag), however, is a diamagnetic material. Diamagnetic substances are weakly repelled by magnetic fields and do not possess permanent magnetic dipoles. When placed in a magnetic field, silver develops a very weak induced magnetic field in the opposite direction. Therefore, silver is not a ferromagnetic material.