PPT Slide

39

• The body-centered cubic unit cell contains one atom from the eight corners and one in the center.

• The face-centered cubic unit cell contains four atoms, one from the eight corners and three from the half-atoms in the six faces.

• The unit cell is the smallest lattice part that exhibits the overall structure,  and the smallest unit of the substance that has its chemical composition.

• Thus, in ionic compounds, the unit cell has the same cation/anion  ratio as the empirical formula.

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