Atoms bond to form crystals in four ways:
The Ionic Bond is the most common in the mineral kingdom. This type of crystal is usually brittle and pale in colour. It is a poor conductor of heat and electricity, but is very symmetrical in shape. This symmetry is caused by the arrangements. Ions are electricity charged atoms that draw other ions of opposite charge to them. The stronger the charge the stronger the crystal. Examples are Halite, and Periclase.
The bonding effect between an ion and its environment extend spherically in all directions.
Electron exchange in ionic bonding.
In this diagram of Halite atoms, the red ions are positive, and the green, negative. As this pattern spreads throughout the crystal in every direction, we expect to see a high degree of symmetry in the overall crystal.
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- Ionic Bonding – GCSE Chemistry Revision (AQA Additional Science – Double and Triple) (mattg99.wordpress.com)
- Covalent Bonding, Structures and Properties – GCSE Chemistry Revision (AQA Additional Science – Double and Triple) (mattg99.wordpress.com)
- Drawing and Reading Ionic Bonding Diagrams – GCSE Chemistry Revision (AQA Additional Science – Double and Triple) (mattg99.wordpress.com)