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Since Aluminum Chloride is a molecular compound, why wouldn't we name it Aluminum trichloride as following the naming rules for molecular compounds? Can all molecular compounds be named without the prefixes for each element?
Since it is an ionic compound, we don't use the prefixes because we can find out the number by checking their respective charges. We use prefixes in covalent bonds because the number of atoms in the molecule is more ambiguous.
From what I've seen online Aluminium chloride is actually polar covalent because of the high polarizing power of Al3+. However, I think because Al always has an oxidation state of 3+, it's implied that there are 3 chlorines.
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