Question

how does interstitial compounds form?
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Answer 1

Answer:

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Explanation:

There are some special set of compounds that the transition metals tend to form. These are called interstitial compounds.

Answer 2

Answer:

The compounds formed when small atoms of H, C or N get trapped inside the crystal lattice of metals is known as interstitial compounds. A number of interstitial compounds are formed by the transition metals. Transition metals react with elements such as hydrogen, carbon, nitrogen, boron etc. to form interstitial compounds.

As vacant spaces of the transition metals are filled up by small atoms, these compounds are hard and rigid.

The chemical properties of the parent transition metals are not altered during the formation of interstitial compounds.

However, there are various changes in the physical properties such as density, rigidity, hardness, malleability, ductility, electrical conductivity etc.

Steel and cast iron are the interstitial compounds of iron which are formed with carbon. In the formation of these compounds, the malleability and ductility of iron are lost to a great extent, but the tenacity of the metal increases.

Transition metals have crystals which are either hexagonal close-packed or face-centered cubic structures. Both of these lattices are very similar and have two type of holes.

Firstly, there can be two tetrahedral holes per metal atom that mean there is a hole between four metal atoms.

Secondly, there can be one octahedral hole per atom that is the hole is between six metal atoms.

Explanation:

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1. they have high melting point
2. they are very hard