"Evolution of Atomic Models"

The atomic model that we used to recognize now a day, doesn´t look as the one that appear at first; as we know, as the time pass and scientits made more experiments based in the previous ones, the atomic model was becoming more complete of information.

First we found Jonh Dlaton in 1803, who discover that an atom is the simplest particle of matter, an so on he invented a a diagram for representing the atomic model, which basically was a dimensional circle with no information. Then appear J. J. Thomson in 1897, who discovered the electrons and their location in the "atomic circle", he called it the "plum-pudding model". After him came Hantaro Nagaoka, in 1904, who established that all atoms contain a nucleus, which is located in the center, and that electrons move in orbits. Ernest Rutherford discovered, in 1911, that the central nucleus located in the atom contains a positive charge and that the electrons, found all over the atom, spin around the nucleus.

In 1913 Niels Bohr established a set conditions that every atom has, as he came out with his model for showing that those electrons spinning around the nucleus move in a circular orbit, taking a fixed distance from the nucleus, defining the energy levels that each electron could have depending to their fixed position from teh nucleus. Then, in 1923, Louis de Broglie made his hypothesis about the waving properties of the motion of electrons, which was proved later with an experiment. Followed by Erwin Schrodinger, who found and established the mathematical equation of the travelling of electrons, known as the formula for getting the atomic orbital, leading to the creation of the Electron Cloud Model, which provides a possible vision of where do electrons could be located in the atom. An at last came James Chadwick, which end to complete the atomic model proving all the past discoveries, as the existence of the nucleus, which had neutrons with no charge and protons with positive charge. 

In conclusion, we were abel of observing how do one discover over the atomic model, as significant as it could be, was the base for other scientist for discovering a new property on atoms.

Bibliography:
Wilbraham, Anthony C., et al. Chemistry. USA: Prentice Hall, 2005.