Chemistry Practice Problems Octet Rule Practice Problems Solution: For elements in the third row of the periodic tabl...

šŸ¤“ Based on our data, we think this question is relevant for Professor Moy's class at UNC.

Solution: For elements in the third row of the periodic table and beyond, the octet rule is often not obeyed. A friend of yours says this is because these heavier elements are more likely to make double or triple bonds. Another friend of yours says that this is because the heavier elements are larger and can make bonds to more than four atoms at a time.Which friend is most correct?

Problem

For elements in the third row of the periodic table and beyond, the octet rule is often not obeyed. A friend of yours says this is because these heavier elements are more likely to make double or triple bonds. Another friend of yours says that this is because the heavier elements are larger and can make bonds to more than four atoms at a time.

Which friend is most correct?

Solution

We are asked to identify the correct reason for why row 3 elements and beyond often don't follow the octet rule.  

The third-row elements and beyond (with the exception of Boron and Aluminum which have incomplete octets) have what is called expanded valence shell electrons or expanded octets. 

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