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Give reason: From element to element, the actinoid contraction is greater than the lanthanoid contraction.

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In lanthanoid elements, the last electron is filled in 4f orbitals, whereas in actinoids the last electrons are filled in 5f orbitals.
The shielding effect of 5f orbitals is poor in comparison to 4f orbitals and due to which the actinoids have a greater effective nuclear charge than lanthanoids.
Therefore there is greater actinoid contraction.

Final Answer:
Actinoid contraction is greater due to the poor shielding effect of 4f orbitals.

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