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2j. The ionic bonding of the compound aluminium oxide
Doc Brown's Chemistry: Chemical Bonding and structure GCSE level, IGCSE, O, IB, AS, A level US grade 9-12 level Revision Notes
Example 2j. A Group 3 metal combining with a Group 6 non–metal
* metals \ non-metals (zig-zag line)
e.g. aluminium + oxygen ==> aluminium oxide Al2O3 or ionic formula (Al3+)2(O2–)3
TWO atoms combine withTHREE atoms to form
Note in this electron diagram, only the original outer electrons are shown above.
The three outer electrons of the aluminium atoms (2.8.3) are transferred to the outer shell of the oxygen atom (2.6) until it has a complete octet shell of outer electrons, just like a noble gas 2.8). At the same time, the aluminium ion also attains a stable noble gas electron structure (2.8).
full electronic structure of aluminium oxide
The electronic dot & cross diagram for the ionic bonding in aluminium oxide
Lewis diagram for the formation of the ionic compound aluminium oxide
Melting point of aluminium oxide is 2072oC
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