It was Quantum model is the modern model of an atom. The neutron had not been discovered when Rutherford proposed his model, which had a nucleus consisting only of protons. In Ch 2 Chemistry Class 11, it will focus on explaining everything about the structure of Atom to the students. The central region of an atom has a very small positively-charged nucleus which contains almost all the mass of the atom. Physicist Ernest Rutherford envisioned the atom as a miniature solar system, with electrons orbiting around a massive nucleus, and as mostly empty space, with the nucleus occupying only a very small part of the atom. The atom was described as a positively-charged sphere embedded with electrons. Ernest Rutherford discovered the proton, a positively-charged particle in an atom. Bohr model is also called Rutherford-Bohr model because it is a modification of the Rutherford model. The Bohr model and quantum model are models that explain the structure of an atom. Bohr model was proposed by Niels Bohr in 1915. The Quantum Mechanical model of the atom doesn't specifically define the place or movement of the path that the electrons in an atom go rather than give the statistics and probability of an electron being at a certain position in the atom at a certain time. Such deflections, though rare, were found, and proved to be a smooth but high-order function of the deflection angle. This model is seen and understood as a nucleus surrounded by an electron cloud.
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