Question

give reason: aluminium has positive valency

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Answer 1

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The element Aluminium has atomic number : 13. So, the electric configuration is : 2 8 3 . The outermost shell contains 3 electrons, which it can donate , to come in octet state . So, as it gives electrons to being in a octet state, it's valency is positive.

Answer 2

atomic no of aluminium is 13 and its distribution of electron will be 2,8,3 so it will donate 3 electron to fill its octate. and then the no of proton became more than no of electron and become 3 units positive charge thus its valency is positive