The projection representation of a unit cell of an ionic crystal of the binary compound A_pB_q is shown in Fig. 4.77. Determine the stoichiometry and the number of formula units in the unit cell. State the coordination number and coordination geometry of ions A and B. Give an example of a compound that adopts this structure, and comment on how a derivative of this structure could exist with the formula A_pB_2q.

Figure 4.77.

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(0,1) Уг 518 ¹18 B O A