Which one of the following findings is NOT observed in Rutherford's Nuclear Model of Atom?

Rutherford's Nuclear Model of the Atom proposed that the nucleus is positively charged (not neutral), as it concentrates all the positive charge of the atom along with most of its mass. Statement (a) is therefore NOT a finding of Rutherford's model. The other statements are all correct: nearly all the mass resides in the nucleus, electrons revolve around the nucleus in circular orbits (as Rutherford proposed, though later modified by Bohr), and the size of the nucleus is extremely small compared to the size of the atom (about 10⁻¹⁵ m vs 10⁻¹⁰ m for the atom).