Question

Electrons in __________ bonds remain localized between two atoms. electrons in __________ bonds can become delocalized between more than two atoms.

Answer 1

Electrons in sigma bonds remain localized between two atoms. Sigma bond results from the formation of a molecular orbital by the end to end overlap of atomic orbitals. Electrons in pi bonds can become delocalized between more than two atoms. Pi bonds result from the formation of molecular orbital by side to side overlap of atomic orbitals.