NextPrevious

Inorganic Chemistry

Organometallic Chemistry

What is the 18-electron rule?

Earlier we talked about the octet rule, which says that elements like carbon and oxygen are most stable when they have eight valence electrons. For transition metals, as we’ve mentioned, the d-orbitals start to become important, so eight electrons just aren’t enough anymore. Since there are five d-orbitals, we need an additional ten electrons to fill the valence shell. And 8 + 10 = 18, hence the 18-electron rule for transition metals.



Close

This is a web preview of the "The Handy Chemistry Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App