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The D-And-f-Block Elements

Question

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In the transition series, with an increase in atomic number, the atomic radius does not change very much. Why is it so?

Solution

With the increase in atomic number along a transition series the nuclear charge increase which tends to decrease the size of atom.
But te addition of electron in the d- subshell increase the screening effect which counter balances the increased nuclear charge.
Hence along a transition series the atomic radius does not change very much.

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?

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