All elements with atomic numbers greater than 83 areradioisotopes<span> meaning that these elements have</span>unstable<span> nuclei and are </span>radioactive<span>. Elements with atomic numbers of 83 and less, have </span>isotopes<span> (</span>stablenucleus) and most have at least one radioisotope (unstable<span> nucleus).
</span>A Radioisotope is also an isotope<span> by nature. The </span>difference<span> is that radioisotopes are very unstable and contain high levels of nuclear energy and emit this energy in the form of nuclear radiation. Main </span>difference<span>: </span>Isotopes<span> can be </span>stable<span> or unstable, but Radioisotopes are always unstable.</span>
<span>While driving your rental car on your trip to Europe, you find that you are getting 9.7 kilometers per liter of gasoline. We know that 1 mile is equal to 1.609 kilometers. So divide 9.7 kilometers by 1.609 kilometrs/mile and you will get 6.03 miles per gasoline</span>
