The radius R of a nucleus of mass number A can be estimated by the formula R =(1.3 × 10^-15) A^1 / 3 m. It follows that the mass density of a nucleus…

The radius $\displaystyle R$ of a nucleus of mass number A can be estimated by the formula $\displaystyle \mathrm{R}=\left(1.3 \times 10^{-15}\right) \mathrm{A}^{1 / 3} \mathrm{~m}$. It follows that the mass density of a nucleus is of the order of : $\displaystyle \left(\mathrm{M}_{\text {prot. }} \cong \mathrm{M}_{\text {neut. }} \simeq 1.67 \times 10^{-27} \mathrm{~kg}\right)$