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The D-And-f-Block Elements

Question

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What are interstitial compounds? What are their main characteristics?

Solution

In the crystal lattices of transition metals-small atoms like C, H, B, N etc. are trapped non-stoichiometrically. Such compounds are called interstitial compounds, e.g., TiC, Mn₄N, Fe₃H, TiH₂ etc. Their main characteristics are:
(i)    They have high melting points than their metals.
(ii)    They become much harder (e.g., borides).
(iii)    Metallic conductivity is retained.
(iv)    They become chemically inert.
(v)    They become less malleable and ductile.

Some More Questions From The d-And-f-Block Elements Chapter

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d¹⁰ 4s¹, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

Why are transition elements so named?

Why are transition elements known as d-block elements?

Write the general electronic configuration of d-block elements.

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