Binding Energy of Helium: \[ B.E = (2m_p + 2m_n - m_{\text{He}}) c^2 \] \[ = 28.4 \text{ MeV} \]
In the year 1911, Rutherford discovered the atomic nucleus along with his associates. It is already known that every atom is manufactured of positive charge and mass in the form of a nucleus that is concentrated at the center of the atom. More than 99.9% of the mass of an atom is located in the nucleus. Additionally, the size of the atom is of the order of 10-10 m and that of the nucleus is of the order of 10-15 m.
Read More: Nuclei