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

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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52.

For the first row transition metals the E° values are:
E° V Cr Mn Fe Co Mc Cu
(M²⁺/M) –1.18 –0.91 –1.18 –0.44 –0.28 –0.25 +0.34
Explain the irregularity in the above values.

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