Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which of the following pairs of elements have almost similar atomic radii? (1) \[Zr,\text{ }Hf\] (2)\[Mo,\text{ }W\] (3) \[Co,\text{ }Ni\] (4)\[Sn,\text{ }Pb\]A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: A
Solution :
The atomic radii of Zr and Hf and Mo and W are similar due to lanthanide contraction. In case of Co and Ni the effect of increased nuclear charge is almost balanced by the increase in size due to increasing shielding effect, hence the atomic radii of Co and Ni are nearly same.
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