Question

What are the valencies of aluminium and oxygen ?​

Answer 1

Answer

Aluminium= +3

oxygen= -2

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Valency.

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Answer 2

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.