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The D-And-f-Block Elements

Question

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How do you explain the paramagnetism and colour exhibited by compounds of transition metals?

Solution

Transition element exhibit colour due to d-d transition, d-d transition is possible only when d- subshell have unpaired electron. Thus transition metal compounds are shows coloure because of the presence of one or more unpaired electrons in the d-orbital of the metal ion. A compound of transition metal appears coloured when one frequency of definite energy is absorbed (E = hv) for d-d transition of the unpaired electron and other frequencies of visible region are transmitted. The colour of the compound corresponds to the frequency of the transmitted light. Thus, the observed colour (frequency) is complementary to the absorbed frequency.

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

Explain why Cu⁺ ion is not stable in aqueous solutions?

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?

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