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# The metal nickel crystallizes in a face centered cubic structure. Its density is 8.90 $gm/cm^3$. Calculate (a) the length of the edge of a unit cell. (b) the radius of nickel atom. (atomic weight of Ni = 58.89)

$(a) 3.53A^{\large\circ},(b)1.247A^{\large\circ}$