1900‚ in order to solve the problem of black body radiation in thermodynamics. In 1874‚ G. Johnstone Stoney postulated a minimum unit of electrical charge‚ for which he suggested the name electron in 1891. In 1897‚ J. J. Thomson confirmed Stoney’s conjecture by discovering the first subatomic particle‚ the electron (now denoted e−). Subsequent speculation about the structure of atoms was severely constrained by Ernest Rutherford’s 1907 gold foil experiment‚ showing that the atom is mainly empty space
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-Static charges don’t move Current electricity- moving electrical charge Ex: outlet & battery -discovered 2 charges positive and negative/ Opposite charges attract like charges repel. 7. J.J Thomson: Cathode ray tube -Discovered and named the electron (e-) 8. Henri Bequerel: discovered that uranium is radioactive Radioactivity = spontaneous emission of radiant E from an element as its nucleus decays. Radioactivity does not come from stable elements. 9. Marrie & Pierre Curie: Discovered 2 radioactive
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Carbon is denoted by the symbol C‚ is part of group 14 on the periodic table‚ and is the fourth most abundant element in the universe (by mass). Carbon has an electron configuration of 1s2‚ 2s2‚ 2p2. With 4 valance shell electrons it is expected to form 4 bonds‚ this means carbon is tetravalent. However the s orbitals do not form the same type of bond (with other atoms) as the p orbitals‚ this is because their shapes are different. For example CH4 would have the following bonds: C(s)-H(s)‚ C(s)-H(s)
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de-broglie wavelength ? a )α-parhcle b ) proton c ) β-particle d ) neutron 4. Dual character of an electron was explained by………. a ) Bohr b ) Heisenbery c ) de-brogle d ) pauli 5. The hybridization in SF6 molecule is………….. a ) SP3 b ) SP3d c ) SP3d2 d ) SP3 d3 6. The enery by an electron in an atom is given by En =………….. a ) -4π2me4n2h2 b ) -2π2me2n2h2 c ) -2π2me4n2h2
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“plums” are the negatively charged electrons‚ while the “pudding” is the mass of positive
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The articles “Energy Shots” by Energyquest.com‚ “Short Circuit” by Explorium.edu‚ and lastly “Conducting Solutions” by Rodney Schreiner all are pieces of writing that present explanations‚ examples‚ and descriptions as to why and how energy is conducted and also a scientific experiment that will show how to conduct energy. First of all‚ “Energy Shots” by energyquest.com explains‚ describes‚ and provideds examples that connect with everybodys daily lifes like what houshold ampliances use and conduct
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Research the answers to the following questions on the internet and write your answers in your own words. For each answer‚ include the address of the web site (or title and author of a book or article) that you used to help you answer the question. Which type of compound usually has higher melting points: ionic compounds or covalent compounds? What is the reason for this difference in melting points? (3 points) Link: http://misterguch.brinkster.net/covalentcompounds.html Answer: Ionic compounds
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Asymmetric Catalysis in Intramolecular Reactions of α-Diazoketones. Abstract: Carbon-hydrogen insertion reactions involve the insertion of a carbene‚ a neutral carbon atom or molecule with two unpaired valence electrons‚ into an unactivated carbon-hydrogen bond. This reaction produces many commercially valuable compounds. The reaction itself involves the use of diazocarbonyl compounds which contain an N2 ligand on a carbon alpha to a carbonyl. The reaction is thermodynamically favourable as it involves
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Figure. 4 depicts electron distributions across the fin in the channel region of NFET and PFET in the on-state (VD=0.5V and VG=0.5V)‚ respectively. Under this condition‚ the highest electron density (NFET) and the hole density (PFET) are generally located in the middle and near the top of the fin. Because the tapered fin structure has FWT shorter than FWB‚ the electron distribution by side gates of the tapered fin is not perpendicular to the
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In the next four paragraphs I will be telling how the story’s helped me to understand the technological science more. The purpose of "Energy Story" is to teach you how all the atoms such as protons‚ neutrons‚ and electrons work when it comes to electricity. We learn all about how electrons have a negative charge and protons have a positive charge‚ and that they have to have an equal amount of negative and positive. The "Energy Story" pretty much teaches us
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