Which of the following metals is magnetic?

• A. Copper
• B. Aluminum
• C. Tin
• D. Nickel

Answer: (D)

Verified step by step guidance

1. Understand that magnetism in metals is primarily due to the presence of unpaired electrons in their atomic or electronic structure, which creates a magnetic moment.
2. Recall that common magnetic metals are typically transition metals with partially filled d-orbitals, such as iron, cobalt, and nickel.
3. Analyze the given options: Copper, Aluminum, and Tin are not magnetic because their electron configurations do not support unpaired electrons that produce strong magnetic moments.
4. Recognize that Nickel, a transition metal, has unpaired electrons in its d-orbitals, which makes it ferromagnetic and thus magnetic.
5. Conclude that among the options, Nickel is the metal that exhibits magnetic properties due to its electronic structure.