One end of a molecule has a positive charge and the other end of the same molecule has a negative charge. What is the best term to describe this molecule?

A) ion

B) dipole

C) isotope

D) electron

An ion is an element that bears only one electric charge, either positive or negative. An isotope is an element with the same number of protons but a different number of neutrons. An electron is a negatively charged subatomic particle. A dipole fits the characteristics. Hence, the answer is B.