Sapphires and rubies are forms of the mineral
corundum, A1,0g. Corundum is one of the hardest known natural materials.
The hardness of fonic compounds depends on the structure of the crystal
and the strength of the ionic bonds. The distance between the aluminum
lons (AP) and oxide ions (027 is 191 pm. Use Coulomb's law to explain how
the bonding in Al2O, influences its properties.
Answers: 2
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Sapphires and rubies are forms of the mineral
corundum, A1,0g. Corundum is one of the hardest known...
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