Identify the incorrect statement among the following - Vidyadip

MCQ

Identify the incorrect statement among the following

A
Lanthanoid contraction is the accumulation of successive shrinkages.
✓
As a result of lanthanoid contraction, the properties of $4d$ series of the transition elements have no similarities with the $5d$ series of elements.
C
Shielding power of $4f$ electrons is quite weak.
D
There is a decrease in the radii of the atoms or ions as one proceeds from $La$ to $Lu.$

✓

Answer

Correct option: B.

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

b
The regular decrease in the radil of lanthanide ions from $L a^{3+}$ to $L u^{3+}$ is known as lanthanides contraction. It is due to the greater effect of the increased nuclear charge than that of screening effect (shielding effect). As a result of lanthanide contraction, the atomic radii of element of $4 \mathrm{d}$ and $5 \mathrm{d}$ come closetr, so the properties of $4 \mathrm{d}$ and $5 \mathrm{d}$ -transition element shows the similarities

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