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a metal crystallizes with a face-centered cubic lattice.The edge of the unit cell is `408` pm. The diameter of the metal atom is :

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a metal crystallizes with a face-centered cubic lattice.The edge of the unit cell is `408` pm. The diameter of the metal atom is :
A. 288pm
B. 408pm
C. 144pm
D. 204pm
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Correct Answer - A
For fcc lattice
Diameter (d) `a/(sqrt2)=(408)/(1.414)=288.5 "pm" ~~288` pm
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