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• Coordination # increases with Issue: How many anions can you arrange around a cation?

COORDINATION # AND IONIC RADII. • Coordination # increases with Issue: How many anions can you arrange around a cation?. Adapted from Fig. 12.4, Callister 6e. Adapted from Fig. 12.2, Callister 6e. Adapted from Fig. 12.3, Callister 6e. Adapted from Table 12.2, Callister 6e.

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• Coordination # increases with Issue: How many anions can you arrange around a cation?

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  1. COORDINATION # AND IONIC RADII • Coordination # increases with Issue: How many anions can you arrange around a cation? Adapted from Fig. 12.4, Callister 6e. Adapted from Fig. 12.2, Callister 6e. Adapted from Fig. 12.3, Callister 6e. Adapted from Table 12.2, Callister 6e.

  2. EXAMPLE: PREDICTING THE STRUCTURE OF FeO • • On the basis of ionic radii, what crystal structure would you predict for FeO? • What are the lattice parameter, the density and the packing factor? • Answer: based on this ratio, --coord # = 6 --structure = NaCl a = 2(0.077) + 2(0.14) = 0.434 nm Data from Table 12.3, Callister 6e. r = {(4x55.85) + (4x16)}/{(0.434x10-7 cm)3 (6.02x1023 atoms/mol)} = 5.84 g/cm3 P.F. = {(4p/3)(4 ions/cell)(0.0773 + 0.143)}/(0.434)3 = 0.656

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