Term 
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        Definition 
        
        
- Strong electrostatic forces hold the ions together.
 
-  High temperature is needed to break these bonds.
 
- Ionic substances are solid at room temperature.
 
- They have high melting and boiling points.
 
 
- When dissolved the ions are free to move so can carry electrical charge.
 
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        Term 
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        Definition 
        
        
- Metallic atoms arranged in layers can slide over each other when force is applied.
 
- This makes them bendable without breaking.
 
 
- Shape memory allows can be deformed and return to their original shape when heated.
 
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        Term 
        
        | Simple covalent structures |  
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        Definition 
        
        
- The covalent bonds between the atoms are strong so they are hard to break.
 
- The intermolecular forces between molecules are much weaker, meaning simple structures can easily be broken.
 
- This gives them low melting and boiling points.
 
 
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