The diagram shows the arrangement of atoms in a crystal. Each atom is at the corner of a cube.
The mass of each atom is $3.5 \times 10^{-25}$ kg. The density of the crystal is $9.2 \times 10^3$ kg m$^{-3}$.
What is the shortest distance between the centres of two adjacent atoms?

1 )
$3.8 \times 10^{-29}$ m
2 )
$6.2 \times 10^{-15}$ m
$3.4 \times 10^{-10}$ m
4 )
$3.0 \times 10^{-9}$ m
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