A) lanthanoids contraction is the accumulation of successive linkages
B) as a result of lanthanoids contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of transition elements
C) shielding power of 4/ electrons is quite weak
D) there is a decrease in the radii of the atoms or ions as one proceeds from La to Lu
Correct Answer: B
Solution :
In each vertical column of transition element, the elements of second and third transition series resemble each other more closely than the elements of first and second transition series on account of lanthanoids 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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