how niels bohr discovered the atom?
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In 1913, Niels Bohr proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in certain well defined quantities. Electrons should move around the nucleus but only in prescribed orbits. When jumping from one orbit to another with lower energy, a light quantum is emitted.
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Technetium. The first element discovered through synthesis was technetium—its discovery being definitely confirmed in 1937. This discovery filled a gap in the periodic table, and the fact that no stable isotopes of technetium exist explains its natural absence on Earth (and the gap).
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The discovery of protons can be attributed to Rutherford. In 1886 Goldstein discovered existence of positively charged rays in the discharge tube by using perforated cathode. These rays were named as anode rays or canal rays.
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Roentgen's x-rays allowed scientists to measure the size of the atom. The x-rays were small enough to discern the atomic clouds. This was done by scattering x-rays from atoms and measuring their size just as Rutherford had done earlier by hitting atoms with other nuclei starting with alpha particles.
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Where does the "X" in "X-ray" come from? The answer is that a German physicist, Wilhelm Roentgen, discovered a new form of radiation in 1895. He called it X-radiation because he didn't know what it was. ... This mysterious radiation had the ability to pass through many materials that absorb visible light.
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Dmitri Mendeleev As we have seen, Mendeleev was not the first to attempt to find order within the elements, but it is his attempt that was so successful that it now forms the basis of the modern periodic table. Mendeleev did not have the easiest of starts in life.
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Atomic theory is the description of atoms , the smallest units of elements. The scientific evidence for the existence of atoms and its even smaller constituents is so vast that most people now consider the existence of atoms to be a fact and not just a theory.
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Röntgen's discovery occurred accidentally in his Wurzburg, Germany, lab, where he was testing whether cathode rays could pass through glass when he noticed a glow coming from a nearby chemically coated screen. He dubbed the rays that caused this glow X-rays because of their unknown nature.
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Answer 1: Ernest Rutherford bombarded nitrogen atoms with helium nuclei (alpha particles), and hydrogen atoms (protons) were formed as a result. From this, he concluded that nitrogen nuclei contained protons. ... Or said more specifically, hydrogen nuclei were always emitted in the process.
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However, experiments with electric discharges in the late 19th century showed that atoms only emit electromagnetic energy at certain discrete frequencies. Bohr resolved this by proposing that electrons orbiting the nucleus in ways that were consistent with Planck's quantum theory of radiation.
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The Bohr model—or solar system model—of the atom describes atoms as consisting of a nucleus with a number of electrons in orbits around that nucleus, similar to a solar system. Because of this, people have speculated that perhaps atoms are like tiny solar systems.
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German physicist Max Planck publishes his groundbreaking study of the effect of radiation on a “blackbody” substance, and the quantum theory of modern physics is born. Through physical experiments, Planck demonstrated that energy, in certain situations, can exhibit characteristics of physical matter.
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Niels Bohr, the Nobel laureate in Physics and father of the atomic model, is quoted as saying, “Prediction is very difficult, especially if it's about the future!” This quote serves as a warning of the importance of testing a forecasting model out-of-sample.
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We now know that atoms are made up of three particles: protons, neutrons and electrons — which are composed of even smaller particles, such as quarks.
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By this time he had already seen the publication of Mendeleev's first periodic table, but his work appears to have been largely independent. In 1869, Russian chemist Dmitri Mendeleev arranged 63 elements by increasing atomic weight in several columns, noting recurring chemical properties across them.
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Thomson atomic model, earliest theoretical description of the inner structure of atoms, proposed about 1900 by William Thomson (Lord Kelvin) and strongly supported by Sir Joseph John Thomson, who had discovered (1897) the electron, a negatively charged part of every atom.
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The answer is that a German physicist, Wilhelm Roentgen, discovered a new form of radiation in 1895. He called it X-radiation because he didn't know what it was. Yes, it's as simple as that. This mysterious radiation had the ability to pass through many materials that absorb visible light.