Question

Please help. My teacher never went over crystal lattices and the book doesn't cover it either :(

Copper crystallizes in a face-centered cubic lattice. If the edge of the unit cell is 351pm, what is the radius of the copper atom?
4r = a*2<sup>1/2</sup>
a is the edge length, r is radius.
r= a/2✅2(2 root 2)where be the edge length

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