It is the Solid Sphere Model, which is the first atomic theory. John Dalton proposed this theory., It is the Plum Pudding Model proposed by John Joseph Thompson. He showed that smaller particles were the building blocks of an atom., It is the Nuclear Model of an Atom proposed by Ernest Rutherford. He illustrated the presence of protons and the nucleus., It is the Planetary Model of the Atom. Niels Bohr proposed this theory and improved the concepts of Rutherford., It is the Quantum Model of the Atom proposed by Erwin Schrodinger.,

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