Why Are 8 Valence Electrons Essential for Atomic Stability?

[jwags99]

TL;DR

Question about the stability of atoms

Hello, all!
I've been trying to understand why the octet rule is followed, but I have not had much luck yet. Does anyone know why 8 valence electrons are ideal for the stability of atoms? I appreciate any help you can give!

 

[kuruman]

When $n = 2$, you have $l = 0, 1$. A completely full shell has 8 electrons, $2\text{s}^22\text{p}^6$ and is energetically stable. Look at post #6 here
https://www.physicsforums.com/threads/why-is-an-atom-with-a-full-shell-more-stable.95897/

 

[mjc123]

This discussion may be of interest:
https://www.chemicalforums.com/index.php?topic=77729.msg283639#msg283639