Question

Identify the incorrect statement among the following :
(a) Lanthanoid contraction is the accumulation of
successive shrinkages.
(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.
(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 1

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

Option (b) is correct.

Explanation:

• As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.
• The reason is that elements of second and third transition series in each vertical column of transition elements resemble each other more closely than the elements of first and second transition series on account of lanthanoid contraction.
• Hence the properties of elements of 4d series of the transition elements resemble with the properties of the elements of 5d series of the transition elements.

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Answer 2

Answer:

thanks for points

Explanation: