The Lanthanoids contraction relates to:
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The Lanthanoids contraction relates to atomic as well as $M^{3+}$ radii.
The atomic and ionic radii $(M^{3+ }$ ions$)$ of Lanthanide elements decrease with increase in atomic number. This effect is called Lanthanoid contraction. This is due to poor shielding of $4f$ electrons.
The atomic and ionic radii $(M^{3+ }$ ions$)$ of Lanthanide elements decrease with increase in atomic number. This effect is called Lanthanoid contraction. This is due to poor shielding of $4f$ electrons.
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