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Assign reasons for the following : (b)...

Assign reasons for the following :
(b) The ionization energy of 5d elements are greater than 3d elements.

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In the 5d series, after alnthanium `(Z=57)` there is lanthanoid contraction. In each group the size of 5d elements Hence, ionisation energies of 5d elements are greater tan 3d elements.
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