1.

Identify the incorrect statement among the following:

Answer»

There is a decrease in the RADII of the ATOMS or ions as one proceeds from La or Lu
Lanthanide contraction is the accumulation of SUCCESSIVE shrinkages
As a RESULT of lanthanide contraction, the properties of 4d series of the transition elements have no similarities withthe 5d series of elements
Shielding power of 4f electrons is quite weak

Solution :The regular decrease in the radii of lanthanide ions from `La^(3+)` to `Lu^(3+)` is known as lanthanides contraction.
It is due to the greatest 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 4d and 5d comes closer, so the properties of 4 d and 5d- transition element shows the similarities.


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