Gold (atomic radius=0.144nm) crystallise...

Gold (atomic radius=0.144nm) crystallises in a face-centred unit cell what is the length of a side of the cell?

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For fcc unit cell

`=2xx(2R)^(2)`
or `a=2sqrt(2)R`
`a=2sqrt(2)R=2xx1.414xx0.144"nm"`
`=0.407"nm"`

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