Which contribution added to rutherford's discovery of a positive nucleus? atoms are indivisible. electrons are scattered in an atom. neutrons are inside the nucleus of an atom. atoms of the same element have the same properties.

C, Neutrons are inside the nucleus of an atom. Rutherford was able to theorize that if neutrons were in the center, and electrons were orbiting in separate energy levels, then protons must be in the nucleus to keep the neutrons bound and not free floating, and if the nucleus has neutral and positive particles, then it has to be a positive nucleus.