A video that associates isotopes with cars with different models is linked. The car association is good, but has a flaw. It would be better to explain an isotope as the same model of car with the same color and external style but with different size engines or some other internal feature that doesn't affect the exterior of the car. Isotopes of a given element have similar chemistry to the base version, just as a there can be versions of cars with the same paint but with different engines.