Identify the incorrect statement among the fo | vedclass

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(B) The regular decrease in the radii of lanthanide ions from $La^{3+}$ to $Lu^{3+}$ is known as lanthanide contraction. It is due to the poor shieldi

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As a result of lanthanoid contraction,the properties of $4d$ series of the transition elements have no similarities with the $5d$ series of elements.

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(B) The regular decrease in the radii of lanthanide ions from $La^{3+}$ to $Lu^{3+}$ is known as lanthanide contraction. It is due to the poor shielding effect of $4f$ electrons,which allows the increased nuclear charge to pull the electrons closer to the nucleus. As a result of lanthanide contraction,the atomic radii of elements of the $4d$ and $5d$ series become very similar,leading to similarities in their chemical properties. Therefore,the statement that $4d$ and $5d$ series have no similarities is incorrect.

Identify the incorrect statement among the following.

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