Question

Which forms interstitial compounds?

• A. Fe
• B. Co
• C. Ni
• D. All

Answer 1

Answer: (D)

All

Answer 2

Transition metals like Fe, Co, Ni, Cu etc. form interstitial compounds with elements such as hydrogen, boron, carbon and nitrogen. The small atoms of these non-metallic elements (H, B, C, N, etc.) get trapped in vacant spaces of the lattices of the transition metal atoms.