Analytical, instrumental, and spectroscopic techniques Gustav Kirchhoff and Robert Bunsen This paper is at the ChemTeam site. Link to biographical data on Bunsen and Kirchhoff. View a biographical sketch of Raman and of Krishnan.
Naturally, we can remember a considerably great number of diverse inventions and scientific theories that have caused global changes in the style of life of all humankind, such as the invention of electronic computers, which initiated the process of global integration of humanity, the creation of the first models of the human psyche, first spaceflights, etc.
In truth, this list can be extended almost indefinitely, guided by the individual preferences of the author. Nevertheless, the invention of the atomic theory that has rewarded the humankind with practically unlimited energy resources, as well as cursed it with a threat of a global nuclear war, perfectly demonstrates the power of science.
Obviously, this discovery would be impossible without diverse previously performed inventions and scientific theories, which have laid the foundations of modern physics, such as we know it today.
One of these significant inventions was the JJ Thomson atomic theory. Doubtlessly, the importance of this work cannot be overrated. Therefore, those students who nourish a desire to understand all the principles of various disciplines in the sphere of modern physics, such as the quantum theory or the string theory, have to pay attention to the JJ Thomson atomic theory in order to realize the convoluted path of scientific thought.
In fact, the history of the JJ Thomson atomic theory can be traced back to when this talented British scientist discovered a new particle, which has been called an electron.
This discovery was a result of the series of experiments with cathode rays. During his experiments, he placed two metal plates on both sides of the tube, one of which was positively charged, whereas the other was negatively charged.
Therefore, the beam was passing through the electric field produced by these charged plates. As a result, he observed a phenomenon of a deflection of cathode rays. The beam was deflected toward the positively charged plate.
Obviously, when the polarity was reversed the direction in which the deflection of the beam occurred also has been changed. By performing this elegant experiment, Thomson proved that the cathode rays could be deflected by an electric field, thereby, the hypothetical particles, which form the cathode rays, have negative electrical charges.
In fact, this was a revolutionary discovery, considering the fact that at that time a great amount of physicists thought that cathode rays are immaterial. Moreover, the conventional model of an atom, which was generally accepted by the scientific community, could not be used for explanation of this phenomenon.
In other words, Thomson discovered new particles that just could not exist according to the conventional atomic theory of that time. This experiment served as a powerful impulse for the formation of new atomic theory that could propose a new atomic model taking into account these new facts about the atomic structure.
The main properties of the electrons discovered by Thomson During the series of different experiments with cathode rays, Thomson discovered a great number of unique properties that are characteristic for the electrons. In fact, all the experiments necessary to demonstrate these properties were accomplished using standard vacuum tubes and emitters that expose cathode rays at that time these rays were also known as Lenard rays.
Here is a brief list of these properties along with a concise description of experiments, which were performed in order to register them experimentally.
Firstly, Thomson proved that the negatively charged particles, which constitute a beam of cathode rays, are moving in a straight line.
In order to prove this hypothesis, he placed a Maltese cross on the path of the cathode rays. As a result, he observed a shadow of the cross on the opposite side of the tube. This demonstrative experiment also proved that metal objects are opaque for the cathode rays.
Secondly, he proved that the particles that constitute the beam have kinetic energy and momentum. Thomson placed a wheel with plates made of mica on the path of the beam. When the tube was activated, the wheel began rotating towards the anode.
In fact, this experiment was also a considerable proof that cathode rays are material, which served as an extra proof for the JJ Thomson atomic theory.
Thirdly, Thomson demonstrated that the electrons produce energy when striking objects.Apr 27, · Research Paper on Atoms. The AMU (atomic mass unit) of a particular element expresses the mass of an atom of that element relative to the mass of the most common isotope of carbon which is Essay on Learning Theory March (62) February (54) January.
The free Chemistry research paper (The Development Of The Atomic Theory essay) presented on this page should not be viewed as a sample of our on-line writing service. If you need fresh and competent research / writing on Chemistry, use the professional writing service offered by our company. Irving Langmuir: papers on the octet theory of chemical bonding.
These papers are at the ChemTeam site: 1 and 2. View page images of original 1 and 2. See a biographical sketch of Langmuir. Wendell Latimer and Worth Rodebush on "Polarity and Ionization from the Standpoint of the Lewis Theory of Valence" (); the last section on associated liquids describes hydrogen bonding.
Atomic Theory and Structure "By convention sweet, by convention bitter, by convention hot, by convention cold, by convention color: but in reality atoms and void." Those are the words of Democritus, one of the founding fathers of the ancient atomic theory, on /5(3). Atomic Theory Research Paper Essay Sample.
Of all of the many scientists who played a major role in the formation of the atomic theory, it is believed that Dalton, Rutherford, Thompson, Bohr, and Planck are the five most influential. Other Essays On History Of Atomic Theory Simplicity And Truth: Albert Einstein Essay words - 3 pages Albert Einstein was born March 14, in Ulm, iridis-photo-restoration.com is considered to be one of the greatest theoretical physicists of all time.