Final answer:
A covalent bond with unequal sharing of electrons is called a polar covalent bond, resulting in partial positive and negative charges on the atoms involved.
Step-by-step explanation:
A covalent bond in which electrons are shared unequally is called a polar covalent bond. In this type of bond, atoms develop partial charges due to an unequal electron distribution. The atom that attracts the electrons more has a partial negative charge (denoted as δ−), and the opposite atom has a partial positive charge (δ+). This imbalance in electron sharing leads to a molecule with distinct positively and negatively charged regions, which affects the physical and chemical properties of the substance.