The two chlorine atoms have a total charge of -2 hence the total charge in the compound is zero. Three oxygen atoms each having a charge of -2 making a total charge of -6 hence the total charge in the compound is zero.
In magnesium chloride, magnesium has a charge of +2. Chlorine has a charge of +1. However, in the compound, there are two chlorine atoms and one magnesium atom. As such, the two chlorine atoms have a total charge of -2 hence the total charge in the compound is zero.
In Aluminium oxide (Al2O3), there are two aluminium atoms having a total charge of +6. There are three oxygen atoms each having a charge of -2 making a total charge of -6 hence the total charge in the compound is zero.
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