- #1

Anabelle37

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## Homework Statement

NaCl is a face-centred cubic with a basis at Na(0,0,0) and Cl at (a/2,a/2,a/2) and lattice parameter a = 5.63 angstrom. calculate the separation between nearesr neighbours (Na and Cl).

## The Attempt at a Solution

Just by looking at the NaCl structure the separation between nearesr neighbours looks like a/2, but I don't know how to explain the answer?