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historical development for atomic structure
Essay of neil bohr
write an essay on the Bohr's atomic model
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The Bohr model is a big part of Chemistry history. Neils Bohr proposed this model in 1913. It states that electrons orbit the nucleus at set distances. The model was an expansion on the Rutherford model overcame (Coffey, Universe Today). Neils Bohr’s model was based on his observations of the atomic emissions spectrum of the hydrogen atom (Coffey, Universe Today). His findings said that the electron can move to a higher-energy orbit by gaining an amount of energy equal to the difference in energy between the higher-energy orbit and the initial lower-energy orbit (pg.102, line 20). But time and research has proven and changed the Bohr model; Making this model one of the most famous models in Chemistry history. As stated earlier, Bohr said that electrons are at a set distance from the nucleus, but this proved to be true only in the hydrogen atom. Bohr’s model of the hydrogen atom explained /observed spectral lines so well that many scientists concluded that the model could be applied to all atoms (pg.103, line 8). It was soon recognized, however, that Bohr’s approach didn’t explain the spectrum of atoms with more than one electron, nor did his theory explain the chemical behavior of atoms (pg.103, line 10). Most significantly, Bohr’s model violates the uncertainty principle because it features electrons with known orbital periods and a definite radius-two attributes which cannot be directly determined simultaneously (aps.org/physics). So basically, Bohr’s model was proved not true, because you cannot know exactly where an electron is at any given moment. Bohr’s model caused scientists to start asking questions. Why did the hydrogen’s electron exist around the nucleus only in certain allowed orbits with definite energies (pg.104, ... ... middle of paper ... ...n what we know now. We can learn so much more from science and chemistry. Though it may not be a subject I particularly love, it has given us so much knowledge on life and our makeup. I have made many points in this paper, but they all center around one subject: Bohr’s model and how big of an influence it made on chemistry history. There are a bunch of details and important equations that have come out of his model, and, although there might be a lot of facts in this paper, it all pertains to Bohr and his model. His model has taken us to where we are today and showed us how we can look at atoms and electrons. The quantum theory we have today would never have existed without him. Though he may have been wrong in his findings, our progress has shown how much truth there really was to Bohr’s model. And in many ways Bohr’s model is a big impact on chemistry history.
The definition doesn’t say anything about the hydrogen atom. All it talks about is the transfer of electron pairs.
The cathode ray tube was invented in 1875 by the name of Sir Williams Crooke. Yet he wasn’t the one to make the big discovery. In 1897, a man by the name of J.J. Thompson conducted a series of experiments to prove the existence of subatomic particles. He wasn’t 100% correct with all of his claims he made but broke the theory John Dalton stated that the smallest form matter could be broken down to was an atom. Having shown the world that there was smaller than an atom, it later caused others to question and dive even deeper.
Although the atomic theory was developed in increments, George Johnston Stoney is most famous for contributing the term electron: fundamental unit quantity of electricity. Stoney would develop the concept fourteen years before he coined the term electron. He also made contributions to the theory of gasses, cosmic physics, and estimated the number of molecules in a cubic millimeter of gas.
physics. The work of Ernest Rutherford, H. G. J. Moseley, and Niels Bohr on atomic
A theory can lead to the development of a model which provides a visual representation and explanation of the scientists’ understanding. A model can assist in predicting what could happen if a particular incident occurs. An example of a model is the Niels Bohr model of the atom.
In 1911, Ernest Rutherford found a very spectacular in such a small thing. Rutherford found that an atom has a microscopic charged nucleus. Empty space surrounds the nucleus. The nucleus is also surrounded by electrons. By this discovery Rutherford made the model of the atom.
...ven his son Aage N. Bohr, was awarded the 1975 Nobel Peace Prize for Physics for the collective model of the atomic nucleus. His Quantum theory and atomic model are both huge impacts in the world of modern chemistry and physics. Even to the day Niels Bohr died on November 18, 1962 he was dedicated to his Open-World Vision on the safety of atomic power between nations.
Bohr, proposed that fission more than likely to occur in the uranium-235 isotope, more effectively, with slow-moving neutrons, which became the classical analysis of the fission process
The model of the atom has been changed many times over the course of history, updating from a theory about cutting things in half to an atom with protons, neutrons and electrons.
It is apparent that, during certain areas of history, the atomic models repetitively questioned as new material became available in the study of that field. Specific concepts begin to elevate themselves above others and become dominant as they begin being experimented on. Judging by the the literature on the development of the atomic model, the first speculations began around the ancient Greek and Roman times.
Stemming from the first years of the 20th century, quantum mechanics has had a monumental influence on modern science. First explored by Max Planck in the 1900s, Einstein modified and applied much of the research in this field. This begs the question, “how did Einstein contribute to the development and research of quantum mechanics?” Before studying how Einstein’s research contributed to the development of quantum mechanics, it is important to examine the origins of the science itself. Einstein took much of Planck’s experimental “quantum theory” research and applied it in usable ways to existing science. He also greatly contributed to the establishment of the base for quantum mechanics research today. Along with establishing base research in the field, Einstein’s discoveries have been modified and updated to apply to our more advanced understanding of this science today. Einstein greatly contributed to the foundation of quantum mechanics through his research, and his theories and discoveries remain relevant to science even today.
The next big step in the discovery of the atom was the scientific test that proved the existence of the atom. After the discovery of the atom we had the discovery of subatomic particles. With the discovery of the subatomic particles came the research, which came from experiments that were made to find out more about the subatomic particles. This research is how we uncovered that most of the weight of an atom is from its nucleus. With the gold foil experiment, tested by Ernest Rutherford, he discovered the existence of the positively charged nucleus. He proved this when the experiment was happening, a small fraction of the photons th...
The development of quantum mechanics in the 1920's and 1930's has revolutionized our understanding of the chemical bond. It has allowed chemists to advance from the simple picture that covalent and ionic bonding affords to a more complex model based on molecular orbital theory.
To start off, learning the Bohr-Rutherford diagrams in grade nine was a very big confusion for me. I had never fully understood how many shells should go around the nucleus nor did I know how to do the many calculations. As I progressed into grade ten, the teachings became easier. The review shows an example such as in the the bohr diagram, a nucleus is in the center, which is a little circle, and following that there are shells surrounding it containing electrons. Each ring can only hold a certain amount of electrons, and so the first shell around the nucleus can hold a maximum of 2 electrons, the next shell is able to hold a maximum of 8 electro...
Scientists from earlier times helped influence the discoveries that lead to the development of atomic energy. In the late 1800’s, Dalton created the Atomic Theory which explains atoms, elements and compounds (Henderson 1). This was important to the study of and understanding of atoms to future scientists. The Atomic Theory was a list of scientific laws regarding atoms and their potential abilities. Roentagen, used Dalton’s findings and discovered x-rays which could pass through solid objects (Henderson 1). Although he did not discover radiation from the x-rays, he did help lay the foundations for electromagnetic waves. Shortly after Roentagen’s findings, J.J. Thompson discovered the electron which was responsible for defining the atom’s characteristics (Henderson 2). The electron helped scientists uncover why an atom responds to reactions the way it does and how it received its “personality”. Dalton’s, Roentagen’s and Thompson’s findings helped guide other scientists to discovering the uses of atomic energy and reactions. Such applications were discovered in the early 1900’s by using Einstein’s equation, which stated that if a chain reaction occurred, cheap, reliable energy could b...