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What does the subscript 2 indicate in the compound MgCl2?

What does the subscript 2 indicate in the compound MgCl2?
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What does the subscript 2 indicate in the compound MgCl2?

User Jdeyrup
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2 chlorine molecules for every one magnesium molecule. Cl——Mg——-Cl.
User Jared Egan
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It means there are two chlorine molecules and there is only one magnesium molecule (because no subscript really just means there is an invisible 1 that isn't listed).
User Akostadinov
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