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Topic 2a - Ionic Compounds (Structure of ionic compounds (Structure called…
Topic 2a - Ionic Compounds
Structure of ionic compounds
Structure called a giant ionic lattice
Closely packed regular arrangement
Very strong electrostatic forces
Dot and cross diagrams
Advantages
Show how ionic compounds were formed
Disadvantages
Don't show structure of the compound
Don't show relative sizes of ions
3D models
Advantages
Show regular pattern
How the ions are arranged
Disadvantages
Sometimes ions aren't shown to scale
Suggest there are gaps between ions and there aren't
Ball and stick models
Advantages
Show relative sizes of ions
Regular pattern in an ionic crystal
Disadvantages
Only let you see outer layer of compound
Properties of ionic compounds
High melting and boiling points due to strong electrostatic attraction
Most ionic compounds dissolve easily in water
Don't conduct electricity when solid because ions held in fixed positions but when melted or dissolved they can