Question:

The atomic radius of Ag is closed to :

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Because of lanthanoid contraction, 5d elements have nearly the same atomic radii as the 4d elements above them.
Updated On: Oct 31, 2026
  • Au
  • Cu
  • Hg
  • Ni
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The Correct Option is A

Solution and Explanation

Atomic radii (pm): Cu = 128, Ag = 144, Au = 144, Hg = 151, Ni = 125.
Ag (4d series) and Au (5d series) have almost identical radii because the poor shielding of the 4f electrons (lanthanoid contraction) cancels the expected increase in size down the group.
So the atomic radius of Ag is closest to that of Au.
Answer: (A) Au
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