996Due to spherical charge distribution in s-orbital, generally s-s overlapping is not so effective as s-p and p-p overlapping.
Where p-orbitals have directional charge distribution and longer lobes which cause more effective overlapping. Thus s-s sigma bond is relatively weak.
Order of the strength of sigma bonds is as follows:
Nature of sigma bond with their Bond strength:-
s-s → 1.0
s-p → 1.73
p-p → 3.0
