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Which consequence results when d-orbital electron shielding fails in lanthanides?

A)Increased metallic bond strength
B)Decreased nuclear effective charge
C)Anomalous ionic radii contraction
D)Enhanced paramagnetic susceptibility

💡 Explanation

When d-orbital shielding is insufficient, the increased nuclear attraction causes lanthanide contraction via the poor shielding effect. This results in smaller than expected ionic radii, because effective nuclear charge isn't fully screened thereby contracting electron orbitals of subsequent elements, rather than expansion.

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