<p>Atomic radius is of the order of&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn>10</mn><mrow><mo>-</mo><mn>8</mn></mrow></msup></math>&nbsp;cm and nuclear radius is of the order of&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn>10</mn><mrow><mo>-</mo><mn>13</mn></mrow></msup></math>&nbsp;cm. The fraction of atom occupied by nucleus is</p>