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400 BCE
Democritus
He said that matter consist of invisible and indivisible particles called atoms and he represented as a simple sphere, the problem was the this model is so simple and is missing the shells, the three subatomic particles. In his experiment he said that if he cut a stone, now it will be two parts of stone and if continue cutting it all be so small that it will be indivisible and invisible. -
400 BCE
Democritus
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J.J. Thomson
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Thomson
He denominated the electrons. With this he create the plum- pudding model that most of the nuclei was a proton and has little parts like chips that are the electrons, but one of his mistakes that he forgot that it includes shells and atomic levels and not that all has to be like very closer. He made the experiment of the lead container that the atoms has empty spaces and that why he made the plum- pudding. -
Ernest Rutherford
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Rutherford
The classic model of an atom was given by Ernest Rutherford called the Rutherford atomic model or Rutherford model of the atom. However, it is not considered the accurate representation of an atom anymore. Rutherford proposed that an atom is composed of empty space mostly with electrons orbiting in a set, predictable paths around fixed, positively charged nucleus. -
Niels Bohr
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Niels Bohr
It consists of a small, dense nucleus surrounded by revolving electrons, but with attraction provided by electrostatic forces rather than gravity. Bohr was able to predict the difference in energy between each energy level, allowing us to predict the energies of each line in the emission spectrum of hydrogen, and understand why electron energies are quantized. It was wrong because It does not account for sublevels (s,p,d,f), orbitals or elecrtron spin. -
Schrödinger
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Schrödiner
He made a mathematical equation which determined that electrons exist in waves within electrons clouds. Quantum Mechanical Model.
