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Solid Sphere Model
John Dalton came upon the Ancient greek idea of atoms. His theory said that atoms are absolutely indivisble and those of any given elements are identical and compunds are combinations of different types of atoms. -
Plum Pudding Model
J.J. Thomson was the one who discovered electrons which he at the time named corpuscles, he won a nobel prize for this discovery. He subsequently produced the Plum Pudding model of an atom, it shows the atom is composed of electrons which are scattered throughout a spherical cloud of positive charge. -
Nuclear Model
Earnest Rutherford came up with the nuclear model, he fired positively charged alpha particles at a thin sheet of gold foil. Most of them passed through with very little deflection, but some deflected at larger angles. This was only possible if the atom was mostly empty space with positive charge concentrated towards the center of the nucleus. -
Planetary Model
Niels Bohr modified Rutherford's model of the atom by stating that electrons move around the nucleus in orbits of fixed sizes and energies. Electron energy in his model was quantised; electrons could not occupy values of energy between the fixed energy levels. -
Quantum Model
Erwin Schrödinger stated that electrons do not move in fixed paths around the nucleus, but in waves. It is impossible to know the exact location of the electrons; instead, we have 'clouds of probability' called orbitals, in which we are more likely to find an electron.