Copper has fcc structure with edge length 495 pm. What is the radius of copper atom in pm?
Q.2 (vi) Copper has fcc structure with edge length 495 pm. What is the radius of copper atom in pm?
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Answer: \(r \approx 175\) pm
In an fcc unit cell atoms touch along the face diagonal: \(4r = \sqrt{2}\,a\).
\[r = \frac{\sqrt{2}\,a}{4} = \frac{a}{2\sqrt{2}} = \frac{495}{2.828} \approx 175\ \text{pm}\]
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· 27 Oct 2026
AI-verified · Oct 2026
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