Lewis structure of MgCl2 and Al2O3 are:

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MgCl₂:

The number of the valence electrons in magnesium is 2 and the number of the valence electrons in chlorine is 7.

In MgCl , total valence electrons are

In Lewis structure all the valence electrons are represented either by dots or crosses around their atoms.

Magnesium will be the central atom with two electrons and chlorine will be shown on terminal with 7 electrons each.

The Lewis structure will be

MgCl2

Al₂O₃:

The number of the valence electrons in Aluminium is 3 and the number of the valence electrons in oxygen is 6.

In Al₂O₃, total valence electrons are =3+3+6+6+6=24

In Lewis structure all the valence electrons are represented either by dots or crosses around their atoms.

Each aluminium will be between two oxygens.

The Lewis structure will be

Al2O3

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