Question

The valency of aluminum is 3 and oxygen is 2 .write the formula of aluminum oxide​

Answer 1

Answer:

Valency of an atom is the number of electrons that are required to be added or removed from the outermost shell of an atom to complete its octate.

Alumunium has an atomic number  (Z) of 13

So, its electronic configuration is [Ne] 3s  

2

 3p  

1

 

Hence, it needs to lose 3 electrons to attain stable configuration, hence its valency is three.  

Oxygen has an atomic number (Z) of 18

So, its electronic configuration is [He]2s  

2

3p  

1

.

therefore, it needs to gain more electrons to attain stable ocate. Hence, its valency is 2

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Answer 2

Answer:

The formula of aluminium oxide is Al2O3.