Copper has face-centered cubic (fcc) lattice with interatomic spacing equal to 2.54 Å . The value of lattice constant for this lattice is

Step-by-step solution

Interatomic spacing for a fcc lattice r= [ ( a 2 )^2+ ( a 2 )^2+(0)^2 ]^ 1 / 2 = a 2 a being lattice constant. a= 2 r= 2 2.54=3.59 Å NOTE : Interatomic spacing is just the nearest neighbours distance.