Showing posts with label electrons. Show all posts
Showing posts with label electrons. Show all posts

Wednesday, February 10, 2010

Langmuir's Theory

LinkGrand.com

the basic idea which was basically correct, that electrons in an atom are arranged in shells which correspond to the periods of the PERIODIC TABLE, and that the most stable configuration (structure) is a complete shell.

Taken from Dictionary of Science

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THE great objection to Langmuir's theory of atomic structure is the difficulty of accepting his hypothesis of stationary electrons.In view of the extraordinary power of the theory, it is important to inquire if Langmuir's argument from the fixity of direction of the valency forces necessarily holds. There appear to be various ways in which the rotation can be imagined of the stable groups of electrons formed by the combination of atoms. The figures represent diagrammatically, according to Langmuir's system, rotating groups of electrons in the outer shells of molecules of neon, fluorine, and oxygen. In the case of the fluorine molecule the six electrons, forming two quartets with two electrons in common, may revolve as a whole. The same thing may happen in the oxygen molecule, or the electrons may revolve as three quartets. Revolution of the stable groups of electrons would add to the stability of the molecules formed by their combination and increase the directional steadiness of the valency forces. In this way it may be possible to reconcile Langmuir's theory with that of Bohr.

Taken from The Smithsonian/NASA Astrophysics Data System



Monday, February 8, 2010

Faraday

LinkGrand.com

the quantity of charge carried by one mole of electrons (which is approximately equal to Avogadro's constant x the charge on an electron), which has the value 9.6487 x 104 coulombs. It was named after Michael Faraday (1791-1867), a British scientist whose contributions to physics and chemistry include ELECTROMAGNETIC INDUCTION, electrolysis and MAGNETIC FIELDS.

Taken from Dictionary of Science

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Michael Faraday, FRS (22 September 1791 – 25 August 1867) was an English chemist and physicist (or natural philosopher, in the terminology of the time) who contributed to the fields of electromagnetism and electrochemistry.


Faraday studied the magnetic field around a conductor carrying a DC electric current, and established the basis for the electromagnetic field concept in physics. He discovered electromagnetic induction, diamagnetism, and laws of electrolysis. He established thatmagnetism could affect rays of light and that there was an underlying relationship between the two phenomena. His inventions of electromagnetic rotary devices formed the foundation of electric motor technology, and it was largely due to his efforts that electricity became viable for use in technology.


As a chemist, Faraday discovered benzene, investigated the clathrate hydrate of chlorine, invented an early form of the bunsen burner and the system of oxidation numbers, and popularized terminology such as anode, cathode, electrode, and ion.


Although Faraday received little formal education and knew little of higher mathematics, such as calculus, he was one of the most influential scientists in history. Some historians of science refer to him as the best experimentalist in the history of science.The SI unit of capacitance, the farad, is named after him, as is the Faraday constant, the charge on a mole of electrons (about 96,485 coulombs). Faraday's law of induction states that a magnetic field changing in time creates a proportional electromotive force.


Faraday was the first and foremost Fullerian Professor of Chemistry at the Royal Institution of Great Britain, a position to which he was appointed for life.


Albert Einstein kept a photograph of Faraday on his study wall alongside pictures of Isaac Newton and James Clerk Maxwell.


Faraday was highly religious; he was a member of the Sandemanian Church, a Christian sect founded in 1730 which demanded total faith and commitment. Biographers have noted that "a strong sense of the unity of God and nature pervaded Faraday's life and work."


Taken from Wikipedia



Saturday, January 2, 2010

Galactic Noise



background noise from galactic sources

Taken from Dictionary of Science

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A diffuse radio signal that comes from the synchrotron radiation of electrons spiraling in the Galaxy's magnetic field. Also known as galactic radiation or galactic radio waves.

The Internet ENCYCLOPEDIA OF SCIENCE