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**1. The problem statement, all variables and given/known data**

Barium crystallizes in a body centered cubic structure in which the cell edge length is 0.5025 nm. Calculate the shortest distance between neighboring atoms in the crystal.

**2. Relevant equations**

Avagodro's number

**3. The attempt at a solution**

0.5025 x 10^-7 cm ( 1/2atoms) (6.022 x 10^23 atoms)

That's as much as I know so far, I can't use bragg's law because I don't have the angle nor the order nor the wavelength to figure it out. How should I solve this?