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  4. If the intermolecular distance between two adjacent copper atoms in solid copper is 256 pm, then the metallic radius of copper is

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Q. If the intermolecular distance between two adjacent copper atoms in solid copper is $256 \,pm$, then the metallic radius of copper is

Classification of Elements and Periodicity in Properties

Solution:

Internuclear distance between $Cu$-atoms in solid copper $=256\, pm$.
Metallic radius $=\frac{1}{2} \times$ length between two atoms
$=\frac{1}{2} \times 256=128 \,pm$