Bent's rule

https://doi.org/10.1351/goldbook.BT07000
In a molecule, smaller bond angles are formed between electronegative @L03518@ since the @C00930@, to which the @L03518@ are attached, tends to direct bonding hybrid orbitals of greater p character towards its more electronegative substituents.
Source:
PAC, 1999, 71, 1919. (Glossary of terms used in theoretical organic chemistry) on page 1926 [Terms] [Paper]