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Silver crystallises in a face centred cu...

Silver crystallises in a face centred cubic unit cell. Each side of the unit cell has a length of 409 pm. What is the radius of an atom of silver? (Assume that each face centred atom is touching the four corner atoms.)

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For face centred cubic unit cell (fcc)
Radius (r) =`(a)/(2sqrt2)=(("409 pm"))/(2sqrt2)`
`=(("409 pm"))/(2xx1.414)=144.6"pm"`
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