when al and o2 react with each other al2o3 is formed . how al2o3 formed ?
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Al is aluminium
O2 is oxygen
Al has a valency of 3& o2 of 2
We know that valencies are exchanged while forming compounds
So it forms Al2O3
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We derive a chemical formula of a compound by cross cross method. In this the valency of the two are interchanged.
So the valency of O is interchanged with the valency of Al .
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