Characteristics of Crystals (reference: class notes and discussion, pg. 374-375) Crystal type Particles in crystal Attractions be-tween particlesMelting/ boiling point Electrical conductivityTexture and solubility Condition for formation ExampleMetallic Network solids Ionic Molecular (polar) Molecular (non-polar) Place a number (corresponding to the descriptions below) in each of the boxes in the chart Particles in crystal1. Atoms or non-polar molecules 2. Positive nuclei surrounded by a sea of negative electrons 3. Atoms 4. Polar molecules 5. Positive and negative ions Attraction between particles6. Electrostatic attraction between instantaneous or induced dipoles (weak London forces) 7. Metallic bond (strong) 8. Electrostatic attraction between ions 9. Electrostatic attraction between dipoles (moderately strong dipole-dipole, or slightly stronger H-bonding) 10. Covalent bonds (strong) Melting/boiling point (relative)11. Highest 12. High 13. Intermediate to high 14. Low to intermediate 15. Lowest Electrical conductivity16. Good conductor
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