Final answer:
The bond formed when there is an unequal attraction for shared electrons between two atoms is called a polar covalent bond, leading to partial charges on the atoms.
Step-by-step explanation:
If the atoms that share electrons have an unequal attraction for the electrons, the bond is called a polar covalent bond. This type of bond occurs when the electronegativity difference between the atoms is significant enough that electrons are not shared equally leading to an imbalance in the electron distribution.
Partial charges develop on the atoms due to the unequal sharing of electrons. In contrast a nonpolar covalent bond is characterized by the equal sharing of electrons between two atoms. When the attraction for electrons is extremely high on one side, the bond becomes an ionic bond.