Question:easy
The atomic radius of Ag is closed to :
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
Step 1: Down a d-block group the radius increases from the 3d to the 4d series, but only very slightly from 4d to 5d.
Step 2: Cu (128 pm) is much smaller than Ag (144 pm) while Au (144 pm) is practically equal to Ag.
Step 3: This near equality of 4d and 5d radii is due to lanthanoid contraction.
Answer: Option 1 (A) Au
Step 2: Cu (128 pm) is much smaller than Ag (144 pm) while Au (144 pm) is practically equal to Ag.
Step 3: This near equality of 4d and 5d radii is due to lanthanoid contraction.
Answer: Option 1 (A) Au
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