Question

What are interstitial compounds and how are they formed by transition elements?

Answer 1

1. Interstitial compounds are formed when small atoms like hydrogen (H), carbon (C), nitrogen (N), or boron (B) get trapped in the vacant spaces (interstices) of the crystal lattice of transition metals.
2. Transition elements form these compounds by allowing these small atoms to occupy the interstitial spaces in their metal lattices.
3. This filling of vacancies makes the interstitial compounds hard and rigid without changing the chemical behavior of the metal.
4. Physical properties such as density, hardness, rigidity, and electrical conductivity are significantly altered.
5. Examples include steel and cast iron, which are interstitial compounds of iron with carbon.
6. Interstitial compounds generally have high melting points, are chemically inert, and maintain electrical conductivity similar to pure metals.