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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?

Answer

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.

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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?

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