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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. 288 pm
B. 408 pm
C. 144 pm
D. 204 pm
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Correct Answer - A
For Fcc structure
`r=a/(2sqrt(2)),a=408"pm"`
`r=((408"pm"))/(2sqrt(2))=144"pm"`
Diameter `=2r=2xx144=288"pm"`
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