# Silver crystallises in fcc unit cell. If the radius of silver atom is 145pm, what is the length of each side of unit cell?

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4r = 1.4*a where r=radius of silver & a=side of unit cell

4*145 = 1.4*a

a = 4*145/1.4 = 414.28 pm where square root of 2 ~ 1.4