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structures to be hard spheres. The distance between the atoms (inter
atomic
distance) in
crystal structures can be determined experimentally by X-ray dif
fraction
analysis.
3
For
example, the interatomic distance between
two
aluminum
atoms4n a
piece of pure
aluminum at 20°C is 0.2862
nm.
The radius of the alu
minum
atom in the aluminum metal
is assumed to be half the interatomic distance,
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