In the rock-salt structure (NaCl), the cations occupy all the octahedral holes.

Name: In the rock-salt structure (NaCl), the cations occupy all the octahedral holes.
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In the rock-salt structure, also known as the sodium chloride structure, the cations (such as Na+) occupy all of the octahedral holes. The anions (such as Cl-) occupy all of the face-centered cubic sites. This arrangement results in a 1:1 ratio of cations to anions and a highly symmetrical crystal structure.

In the Rock-Salt Structure (NaCl), the Cations Occupy All the Octahedral