  We introduce a theory of chemical bond with a corpuscular picture of
electrons. It employs a minimal set of localized electron wave packets with
'floating and breathing' degrees of freedom and the spin-coupling of
non-orthogonal valence-bond theory. It accurately describes chemical bonds in
ground and excited states of spin singlet and triplet, in a distinct manner
from conventional theories, indicating potential for establishing a dynamical
theory of electrons in chemical bonds.
