What is Plum-Pudding model of the atom?
J.J Thomson proposed that an atom possesses a spherical shape (radius approximately 10-10m) in which the positive charge is uniformly distributed. The electrons are embedded into it in such a manner as to give the most stable electrostatic arrangement. This model is known as Plum-pudding model of the atom.
Do protons and neutrons have identical mass?
What did Rutherford's experiment on scattering of particles show for the first time?
Are neutrons present in all atoms?