Final answer:
Ionic bonds involve electron transfer, while covalent bonds involve electron sharing. Nonpolar covalent bonds have equal electron sharing, whereas polar covalent bonds have unequal electron sharing.
Step-by-step explanation:
Ionic bonds, polar covalent bonds, and nonpolar covalent bonds are all types of chemical bonds, but they differ in terms of electron sharing and electronegativity. Ionic bonds involve the transfer of electrons from one atom to another, resulting in the formation of ions. Covalent bonds, on the other hand, involve the sharing of electrons between atoms. Nonpolar covalent bonds occur when electrons are shared equally between atoms, while polar covalent bonds occur when electrons are shared unequally, leading to a partial positive or negative charge on the atoms involved.