A) There is a decrease in the radii of the atoms or ions as one proceeds from La or Lu
B) Lanthanide contraction is the accumulation of successive shrinkages
C) As a result of lanthanide contraction, the properties of 3d series of the transition element have no similarities with 5d series of elements
D) Shielding power of 4f electrons is quite weak
Correct Answer: C
Solution :
The regular decrease in the radii 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. As a result of lanthanide contraction, the atomic radii of element of 4d and 5d come closer, so the property of 4d and 5d transition element shows the similarities.
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