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physicist Henry Moseley. He demonstrated that a relation existed be- tween the wavelength in the X-ray spectum and the atomic number. From this relation, Moseley concluded: “There are here three possible

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• Mendeleev and the Periodic System

physicist Henry Moseley. He demonstrated that a relation existed be- tween the wavelength in the X-ray spectum and the atomic number. From this relation, Moseley concluded: “There are here three possible

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• Mendeleev and the Periodic System

practical…. On the other hand, what if I put a mirror on the out- side to reflect more of the sun’s rays onto the ab- sorber? That way I could make the device smaller.” Soon, Augustin had completed the construc- [...] was an open-ended cone, with the cu- rious mathematical name of “frustocone,” that focused the sun’s rays along a line on its axis where a narrow cylindrical heat absorber, which contained the steam generator [...] s. Augustin and Abel used the steam generator to drive an ice-making machine, using the hot sun’s rays to produce a block of ice. The people at the fair marvelled at the phenomenon—producing ice from heat

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• Mouchot and the solar cooker

developed the first parabolic solar collector. He designed a new collector, which concentrated the rays of sunlight from all sides of absorber. He experimented with a water-filed container enclosed in glass [...] the conical mirror and implemented in cooker in 1870’s. Parabolic mirror concentrate the reflected rays of sun light to a point and cone concentrate light to a line. Mou- chot found out that cone mirror

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• Mouchot and the solar cooker

the web and to present certain points about the cathode rays, the X- rays, the rays of Becquerel, the a, b, c, rays or the alpha, βeta, and γ rays, based on a proposed framework data collection. 6. Write [...] Becquerel’s discovery and the Curie couple’s discoveries concerning their researches on the Becquerel’s rays. 3. Describe the procedures which Maria and Pier Curie succeeded to isolate radium and to determine

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• Maria Skłodowska-Curie: discoverer of two radioactive elements

the rays was the context in which there were realized important scientific achievements such as the cathode rays, the X-rays, the rays of Becquerel, the a,b,c, rays or the alpha, βeta, and γ rays. Please [...] important points: (the political and social situation prevailing at that time, the study the Becquerel rays, the discovery of two new chemical elements by Maria Curie with her husband, the Nobel Prize was given [...] ……………………………………………………………………………………………………………… ……………………………………… Activity 4 Maria and Pierre Curie studied the "rays of Becquerel». Please look for online information about the discovery of Becquerel. (Indicatively

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• Maria Skłodowska-Curie: discoverer of two radioactive elements

2004). Particularly, the analysis of cathode rays appeared to be promising. Among the researchers working in this field was J. J. Thomson. He analyzed cathode rays and established that they were formed by [...] due to Röntgen’s demonstration of X-rays. His discov- ery opened a new scientific field, which was not entered immediately by him or other scientists since the rays emitted from uranium salts were merely [...] ly, the α-rays turned out to be nuclei of helium, an element that, until then, had been detected only in the sun with spectroscopic methods and seemingly did not exist on Earth. That α-rays were positive

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• Maria Skłodowska-Curie: discoverer of two radioactive elements

2004). Particularly, the analysis of cathode rays appeared to be promising. Among the researchers working in this field was J. J. Thomson. He analyzed cathode rays and established that they were formed by [...] due to Röntgen’s demonstration of X-rays. His discov- ery opened a new scientific field, which was not entered immediately by him or other scientists since the rays emitted from uranium salts were merely [...] ly, the α-rays turned out to be nuclei of helium, an element that, until then, had been detected only in the sun with spectroscopic methods and seemingly did not exist on Earth. That α-rays were positive

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• Maria Skłodowska-Curie: discoverer of two radioactive elements
• Joliot-Curie and artificial radioactivity
• Rutherford’s Nuclear Atom
• Dalton and the atoms
• Lavoisier and the conservation of mass
• Democritus and the atoms

the J.J. Thompson’s atomic model and the Rutherford’s atomic model. 3. Design the courses of the a rays in the J.J. Thompson’s atomic model and the Rutherford’s atomic model. 4. Locate the differences between

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• Rutherford’s Nuclear Atom

Particularly the analysis of cathode rays appeared to be very promising; among the researchers working in this field was J.J. Thomson. Thomson analyzed these cathode rays and established that they are formed [...] experiments in which he used different cathode materials to emit the rays (which were basically emitted by heating up the cathode, the rays were then accelerated with an electric field). Thomson could show [...] due to Röntgen’s demonstration of the X-rays) opened a new field. Yet, this field was not entered immediately by Becquerel himself or other scientists, but the rays emitted from Uranium salts were just

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• Rutherford’s Nuclear Atom