If aluminum (al) and sulfur (s) form an ionic compound, what is the charge on each ion and the formula for the compound?

Al³⁺, S²⁻; Al₂S₃

Explanation:

Al is a metal, so it loses its three valence electrons in a reaction to form Al³⁺ ions.

S is a nonmetal. It needs two more electrons to complete its octet, so it tends to form S²⁻ ions.

We can use the criss-cross method to work out the formula of the compound.  

The steps are

When we use this method with Al³⁺ and S²⁻, the formula for the compound formed becomes Al₂S₃ .

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the dissolution of polymer can be thermodynamically described in 2 steps.