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QUESTION

# How can I write the formula for aluminum chloride?

Aluminum Chloride has a formula of AlCl_3.

Aluminum typically is a cation and has an charge of Al^(+3). Chlorine typically is an anion and has a charge Cl^(-1).

In order to bond ionically the charges must be equal and opposite. It will take three -1 chloride ions to balance one +3 aluminum ion forming an aluminum chloride molecule of AlCl_3.

I hope this was helpful. SMARTERTEACHER