The dand fblock elements - Result Question 76
####76. Identify the incorrect statement among the following:
[2007]
(a) Lanthanoid contraction is the accumulation of successive shrinkages.
(b) As a result of lanthanoid contraction, the properties of $4 d$ series of the transition elements have no similarities with the $5 d$ series of elements.
(c) Shielding power of $4 f$ electrons is quite weak.
(d) There is a decrease in the radii of the atoms or ions as one proceeds from $La$ to $Lu$.
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Solution:
- (b) Due to lanthanoid contraction the properties of $4 d$ series of the transition element have similarities with the $5 d$ series of elements.
There is a steady decrease in the radii as the atomic number of the lanthanide elements increases. For every additional proton added in nucleus the corresponding electron goes to $4 f$ subshell.
