what does a nucleus of an atom contain
An atom is made from a nucleus surrounded by electrons. The nucleus contains protons and neutrons. Isotopes are atoms that have the same number of protons, but different numbers of neutrons.An early model of the atom was the plum pudding model.It was disproved by Rutherford's scattering experiment and replaced by the nuclear model.he nucleus contains protons and neutrons. Isotopes are atoms that have the same number of protons, but different numbers of neutrons. An early model of the atom was the plum pudding model. It was disproved by Rutherford's scattering experiment and replaced by the nuclear model.