![]() From the concept of orbitals, one explains molecular structure, chemical bonding, hybridization etc and also things like spectrum of various materials. Only when the idea of electrons as particles in atoms was introduced, attempts were made to understand chemical bonding and other physical and chemical properties.Īs of now, the electron cloud model which incorporates the principles of quantum mechanics is the most successful. The air we breathe, he knew, was composed of dierent gases. These models were used to explain and hence to understand properties of matter. In 1808, Dalton revived Democritus’s idea that matter is composed of atoms, proposing a chemical atomic theory based on what he called the Law of Constant and Multiple Proportions, which grew out of his interest in Earth’s atmosphere. It was soon realized that the model was flawed and soon Bohr put up his model in which he used Quantum concepts of Planck and Einstein to explain stability of matter and the Hydrogen spectrum.Īnd they process continued when Sommerfeld proposed his model. These are the notes (and diagrams) I use when I teach the atomic nature. In his model, he took the electrons embedded into the positive sphere because he found that these electrons (not some positively charged particle) were emitted by a vast range of marerials.įurther, when Lord Rutherford discovered that the positive charge and most of the mass was concentrated in a small region called the nucleus, the proposed his model based on what evidence was available at that time on properties of atoms. 10:59 PM The development of the atomic model It is a story of how ideas changed about the nature of the atom. However, they should be able to explain the basic properties of matter.įor example, when the electron was first discovered, then JJ Thompson proposed the plum cake model in which he took into consideration the two main points -ġ) From the CRT experiments, it was clear that all matter had those electrons within then thus it would be logical to suppose that electrons were a part of atoms.Ģ) In order to explain the charge neutrality, he supposed that the sphere in which electrons are embedded is positively charged. ![]() Such models would be purely theoretical constructs. When the exact structure of the atom remained quite unknown, models were proposed based on experimental evidence of the properties of matter. An atomic model is a theory trying to explain the structure of the atom.
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