Linked from
The 20 pages that link to Octet rule, each with the reason it gives.
Covalent bondRelated: Shared pairs help many main-group atoms approach an octet.
Lewis structureRelated: It guides the usual placement of bonds and lone pairs around many atoms.
ResonanceRelated: Valid contributors usually preserve suitable valence-shell electron counts.
Lone pairRelated: Counting lone pairs helps determine whether an atom satisfies the octet rule.
Main-group elementRelated: It summarizes bonding patterns common among many p-block elements.