An ionic bond is _?_
a. formed when electrons shared between two or more electrons is unequally shared.
b. a chemical bond where two atoms share the electrons in the outer shell.
c. is a chemical bond formed by the transfer of one or more electrons from the outermost energy level (the valance shell) of one atom to that of the other.
d. is formed when the a hydrogen bond already covalently linked to one electronegative atom binds with another electron hungry atom to form a bridge.