Answer:
An electron-deficient compound is one in which the central atom’s octet is incomplete due to a lack of electrons. The number of electrons in these compounds is insufficient to form conventional electron-pair bonds between the linked atoms.
Example: Electron-deficient compounds, such as B2F6, Al2Cl6, and others, have less than 8 electrons in their valence shells. Electron excess compounds, on the other hand, are those with more than 8 electrons in the valence shells, such as SF6, O8F8, and so on.