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Questions
Cu crystallizes in fcc unit cell with edge length of 495 pm. What is the radius of Cu atom?
Copper has fcc structure with edge length 495 pm. What is the radius of copper atom in pm?
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Solution
Given: Type of unit cell is fcc.
Edge length of unit cell (a) = 495 pm
To find: Radius (r) of Cu atom = ?
Formula: For fcc unit cell, r = 0.3535 a
Calculation: Using the formula,
r = 0.3535 a
= 0.3535 × 495 pm
= 175 pm
∴ The radius (r) of a Cu atom is 175 pm.
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