Which of the cations in Table 12.3 would you predict to form fluorides having the cesium chloride crystal structure? Justify your choices.
Table 12.3 Ionic Radii for Several Cations and Anions for a Coordination Number of 6
Cation | Ionic Radius (nm) | Anion | Ionic Radius (nm) |
Al3+ | 0.053 | Br– | 0.196 |
Ba2+ | 0.136 | Cl– | 0.181 |
Ca2+ | 0.100 | F– | 0.133 |
Cs+ | 0.170 | I– | 0.220 |
Fe2+ | 0.077 | O2- | 0.140 |
Fe3+ | 0.069 | S2- | 0.184 |
K+ | 0.138 |
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Mg2+ | 0.072 |
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Mn2+ | 0.067 |
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Na+ | 0.102 |
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Ni2+ | 0.069 |
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Si4+ | 0.040 |
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Ti4+ | 0.061 |
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