Ar crystallizes in a F.C.C lattice with ...

Ar crystallizes in a F.C.C lattice with one atom at each lattice point. If the edge length is `5.311A^(0)` at OK, the distance between nearest neighbouring atoms in Ar at 'O'K is

`3.755A^(@)`

`7.355A^(@)`

`5.735A^(@)`

`1.877^(@)`

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