The effect of lanthanoid contraction in the lanthanoid series of elements by and large means:

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Concept: Lanthanoid Contraction

As we move across the lanthanoid series (La → Lu), the nuclear charge increases by 1 for each element while electrons are added to the inner 4f subshell.

4f electrons provide poor shielding of the nuclear charge compared to outer electrons, because:
- 4f orbitals have diffuse, complex shapes
- They do not effectively shield the outer electrons from the increasing nuclear charge

Effect: The effective nuclear charge experienced by the outer electrons increases pr

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