Explain what would be the formula & name of the compound between the two elements below and identify the charges of the ions. Show ionic bonding between elements Aluminum & Sulfur. Please...

Explain what would be the formula & name of the compound between the two elements below and identify the charges of the ions. 

Show ionic bonding between elements Aluminum & Sulfur.

Please explain with as much detail as possible.

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ncchemist | eNotes Employee

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First let's look at the valence shell electrons for both Al and S.  This will tell us the charges of the ions they form, which in turn will tell us the compound these to elements will make together.  Al is in group 13 on the periodic table.  That means that it has 2 s electrons and 1 p electron in its outer orbitals.  Since it has a total of 3 valence electrons, it will lose all three of them to achieve an octet and will become a 3+ cation (3 positive charges).  S is in group 16 on the periodic table.  That means that it has 2 s electrons and 4 p electrons in its outer orbitals.  Since it has a total of 6 valence shell electrons, it will gain two extra electrons to become a 2- anion (2 negative charges) to achieve an octet.

So Al will form the Al(3+) ion and S will form the S(2-) ion.  So to join together to form a chemical compound, we will need two of the Al ions and 3 of the S ions.  The chemical formula will be Al2S3.  This gives a total of 6 positive charges and 6 negative charges for a sum total charge of 0 (neutral species).  This compound is called aluminum sulfide.

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