1A_Lecture_11

1A_Lecture_11 - Solid Structures Ionic Solids: Are built...

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Chapter 16 – Liquids and Solids Solid Structures Ionic Solids: Are built from the mutual attractions of cations and anions. 1 Example: Metal and a non-metal, NaCl, MgBr 2 , K 2 O Note: For ionic species the unit cell must reflect the stoichiometry of the compound and be electrically neutral.
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Chapter 16 – Liquids and Solids Solid Structures Green = Anions Orange = Cations Rock-Salt Structure This structure is found in compounds whose cations and anions differ in size. The cations are located in the octahedral holes of the cubic closed- packed structure. 2 Note: Cations (Na + ) are usually smaller than anions (Cl - )
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Chapter 16 – Liquids and Solids Solid Structures Coordination Number (Ionic Solids): The number of opposite charged ions immediately surrounding a specific ion. 3 Note: Other structures that have the rock salt structure include: KBr, RbI, MgO, CaO, and AgCl Note: This structure has a radius ratio ( ρ ) between 0.4 and 0.7 In the rock-salt structure the coordination number of Na + (orange) is 6 and the coordination number of Cl - (green) is also 6. NaCl is said to have (6,6)- coordination [(cation, anion)- coordination]
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Chapter 16 – Liquids and Solids Solid Structures The cesium chloride structure is found for compounds whose cations and anions are similar in size to each other. 4
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1A_Lecture_11 - Solid Structures Ionic Solids: Are built...

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