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Plum Pudding Model



The plum pudding model of the Atom was proposed in 1897 by J.J. Thompson. He also discovered the Electron in 1897. The plum pudding model was first proposed in 1904, before the discovery of the atomic nucleus. In this model, the atom is composed of electrons (which Thomson still called "corpuscles,")

Planetary Model



The Rutherford model or planetary model of the atom was created by Ernest Rutherford 1909. Rutherford discovered his early analysis in 1911 of the plum pudding model was incorrect. Rutherford's new model for the atom, based on the experimental results, had the new features of a relatively high central charge concentrated into a very small volume in comparison to the rest of the atom. Also he found the atom to contain the bulk of the atomic mass in the nucleus of the atom.

Bohr Model



The Bohr Model was created by Niels Bohr in1913. The model shows the atom as a small, positively charged nucleus surrounded by electrons. The Electrons travel in circular orbits around the nucleus. This model is often combined with Rutherford’s.

Daltons Atom

In 1766 chemist John Dalton put forth the first modern theory about what an atom looks like. Dalton said that atoms were small, indivisible indestructible, solid spheres. Dalton also added that all matter was composed of these atoms, and all atoms of identical substances have the same properties.