Consider the following four molecules. Which of these satisfy the octet rule and which do not?
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A Lewis structure shows the arrangement of atoms and valence electrons in a molecule. Most often, each bonding pair of electrons is shown as a line whereas nonbonding electrons are shown as dots as seen here. Notice that each atom is surrounded by a total of eight electrons, an octet.
For elements in neutral molecules, the number of bonds needed to achieve an octet follows a trend by group, as shown in the following table
Exceptions to the octet rule
Exceptions to the octet rule include hydrogen, which is stable with only two electrons (one bond), and boron, which is stable with only six electrons (three bonds). Additionally, elements in period 3 and beyond sometimes form more than the typical number of bonds, thus expanding their valence shells to more than eight electrons.
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Octet Rule concept. You can view video lessons to learn Octet Rule. Or if you need more Octet Rule practice, you can also practice Octet Rule practice problems.