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What helps in determining the formula of an ionic compound?

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Valency helps in determining the formula of an ionic compound. Valency can be used to ind out how the atoms of an element will combine with the atoms of another element to form a compound. 

For example: Magnesium chloride 

By applying criss-cross method:

Formula: MgCl2 

Thus, the formula for magnesium chloride is MgCl2 .

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