Topic 2a - Ionic Compounds
Structure of ionic compounds
Properties of ionic compounds
Structure called a giant ionic lattice
Closely packed regular arrangement
Very strong electrostatic forces
Dot and cross diagrams
3D models
Ball and stick models
Advantages
Disadvantages
Show how ionic compounds were formed
Don't show structure of the compound
Don't show relative sizes of ions
Advantages
Disadvantages
Show relative sizes of ions
Regular pattern in an ionic crystal
Only let you see outer layer of compound
Advantages
Disadvantages
Show regular pattern
How the ions are arranged
Sometimes ions aren't shown to scale
Suggest there are gaps between ions and there aren't
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