CHEM 121 glossary
Octet rule
Atoms tend to bond until each is surrounded by 8 valence electrons (a noble-gas count); H needs only 2, the duet. Period-2 atoms (C, N, O, F) never exceed 8.
Example
In , C has 4 bonding pairs (8 e⁻) and each H has 1 bonding pair (2 e⁻). (6 e⁻ on B) and (12 e⁻ on S) are exceptions.