<p>One requires energy&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>E</mi><mi>n</mi></msub></math>&nbsp;to remove a nucleon and an energy&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>E</mi><mi>e</mi></msub></math>&nbsp;to remove an electron from the orbit of an atom, then&nbsp;</p>