Ferromagnetic materials are those that exhibit strong magnetic properties, where the magnetic moments of the atoms tend to align in the same direction upon an external magnetic field, even remaining magnetized after the external field is removed. Among the elements listed, chromium (Cr ) does not exhibit ferromagnetic properties. Let's consider each element: Option A: Chromium (Cr) - Chromium is actually antiferromagnetic. In antiferromagnetic materials, adjacent electrons pair up with opposite spins, which cancels out their magnetism at a macroscopic scale. This is why Cr does not exhibit ferromagnetic properties. Option B: Iron (Fe) - Iron is well-known as a ferromagnetic material, widely used in various applications for its magnetic properties. It is one of the most common ferromagnetic materials. Option C: Cobalt (Co) - Cobalt is ferromagnetic. It is part of the rare-earth metals and, like iron, is used for making magnets. Option D: Nickel (Ni) - Nickel is another well-known ferromagnet, although it has weaker magnetic properties than iron. Therefore, the correct answer is Option A: Chromium (Cr), as it does not exhibit ferromagnetic properties like the other elements listed.