The diagram illustrates how the atoms are arranged in a certain crystal. Every atom lies at a cube corner. The mass of one atom is $3.5 \times 10^{-25}\ \text{kg}$. The density of the crystal is $9.2 \times 10^{3}\ \text{kg m}^{-3}$. What is the minimum distance between the centres of two neighbouring atoms?
- A$3.8 \times 10^{-29}\ \text{m}$
- B$6.2 \times 10^{-15}\ \text{m}$
- C$3.4 \times 10^{-10}\ \text{m}$
- D$3.0 \times 10^{-9}\ \text{m}$