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The D-And-f-Block Elements

Question

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The first ionisation energies of third transition series is higher than those of first and second transition series. Why?

Solution

In the atoms of third transition series, these are filled 4f-orbitals. The 4f-orbitals have very poor shielding effect. As a result, the outer electrons have greater effective nuclear charge acting on the outer valence electrons. Therefore, their ionisation energy are higher.

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

How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?

Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?

Which is a stronger reducing agent Cr²⁺ or Fe²⁺ and why?

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?

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