Determine the number of sodium ions and chloride ions present in the face-centered cubic unit cell of sodium chloride.
Strategy

Use Figure 11.27 to count the atoms of each type. Remember that an atom in a corner contributes one eighth of an atom to that unit cell, an atom on a face contributes only half, and an atom on an edge contributes one fourth. Recall also that there is a sodium ion in the center of the unit cell.

Figure 11.27

Transcribed Image Text:

CI- Na+