The dand fblock elements - Result Question 73
####73. Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers).
[2015]
(a) $Zr(40)$ and $Nb(41)$
(b) $Zr(40)$ and $Hf(72)$
(c) $Zr(40)$ and $Ta(73)$
(d) $Ti(22)$ and $Zr(40)$
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Solution:
- (b) $Zr(40)$ and $Hf(72)$ are in the same group
(4). Because of lanthanoid contraction, they have nearly same atomic radii.
