What are the valencies of aluminium and oxygen ?
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Aluminium= +3
oxygen= -2
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Valency.
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oxygen
Atomic no: 8
valence shell: 2
Aluminum
Atomic no: 13
Valence shell : 3
The charge of Aluminium is +3 and the charge of Oxygen is -2. Therefore, we can conclude that the valency of Aluminium in Al2O3 is 3 and the valency of Oxygen in Al2O3 is 2. Note: Aluminium loses the 3 valence electrons to gain the noble gas configuration of Neon, which is 2,8.
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