The Health Physics Society 1313 Dolley Madison Blvd. Studying the experimental results, Rutherford proposed a nuclear theory of the atom which states that atom consists of a positive core called the nucleus, where most of mass of the atom is contained and electrons which move round the nucleus. ![]() Thanks to the following group for allowing us to reprint this information: This idea formed the basis for his "liquid drop" model of the nucleus which would provide Lise Meitner and Otto Frisch with the theoretical basis for their explanation of fission. The main postulates of the model are: An atom is made up of three particles : electons, protons and neutrons. Later, Bohr hypothesized how an incoming particle could strike a nucleus and create an excited "compound" nucleus. In 1912, Niels Bohr put forward a model to explain the structure of an atom. This led Bohr to his famous principle of complementarity, whereby the electron could be interpreted in two mutually exclusive yet equally valid ways: by either the particle or wave models. Later, Louis de Broglie and Erwin Schrödinger described the electron as a standing wave rather than a particle, which "explained" how Bohr's electrons could move about within a defined energy level without emitting radiation. In recognition, Bohr received the Nobel Prize in physics in 1922. Electrons have negative charge, protons have positive charge whereas neutrons have no charge, they are neutral. To Albert Einstein, Bohr's achievements were "the highest form of musicality in the sphere of thought". In 1912, Niels Bohr put forward a model to explain the structure of an atom. Niels Bohr was a Danish physicist who had a theory about atoms that he called the atomic model. That the energy of the emitted or absorbed radiation must equal the difference between the original and final energy levels of the electrons explained why atoms only absorb certain wavelengths of radiation. In the annals of scientific history, few names shine as brightly as Niels Bohrs. Only if the electrons dropped to a lower energy level, or were raised to a higher level, would they emit or absorb electromagnetic radiation. He envisioned specific discrete energy levels (i.e., shells) for the electrons within which they could move yet not emit radiation. elements can be combined to form compounds that have the. the atom in one element is unique than another. atoms are indivisible in chemical processes. all atoms of a given element are identical. Niels Bohr provided the explanation by incorporating Max Planck's quantum theory into Rutherford's atomic model. First to propose the existence of an ultimate particle, the atom and believed that it was a solid. ![]() Contradictory to electrodynamic theory the electrons did not emit electromagnetic radiation. ![]() Ernest Rutherford's model of the atom, developed at the turn of the century, pictured negatively charged electrons moving in circular orbits about a positively charged nucleus.
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