Why does a full valence shell have as little energy per electron?

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My main question was, “why are atoms with full valence shells stable?” Because the octet rule and others clearly state atoms with 8 electrons in the outermost orbit are stable, but there is no clear explanation as to why. But it had been posted before on Reddit, and even this on community.

I stumbled upon some answers that mentioned, ‘electrons in a full valence shell have as little energy as possible per electron (as opposed to an unfilled valence shell).’ Please let me know if this is true, or if there are any other responses/ways to think about it. Any clarifications will be appreciated!

In: Chemistry
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