------------------------------------------------- 1.Top of Form Arrange the following elements in order of increasing electronegativity: germanium‚ bromine‚ selenium‚ arsenic Please answer this question according to the general rules you have learned regarding periodic trends. DO NOT base your answer on tabulated values since exceptions may occur. | germanium smallest arsenic selenium bromine largest Feedback: Electronegativity is the ability of an atom in a molecule to attract electrons
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Today’s world is overrun by computers from the small to the big. These include the desktop that is in many homes to the cell phones in your pocket. Even things like your car‚ dishwasher‚ dvd player‚ and even TVs include some form of computers. All this would not be possible without the invention of the integrated circuit or IC. This led to the creation of the Microprocessor or CPU (central processing unit) which acts as the brain of the computer. To better help illustrate the function and need for
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Ewells because they are white. Mayella‚ being different from the other Ewells‚ wants to experience the world outside of the filth she lives in: “Against the fence‚ in a line‚ were six chipped-enamel slop jars holding brilliant red geraniums.” The germaniums suggest that Mayella desires to be better than her surroundings‚ to aspire to higher things. Another reason as to why she immediately seizes her chance to finally access the privileges of white womanhood after years of living among pigs. She is
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The development of Periodic Table Elements such as gold and silver have been known since the earliest times. In 1649‚ a German alchemist‚ Hennig Brand made the first scientific discovery of an element‚ phosphorous. In the next 200 years‚ knowledge about the properties of elements and their compounds was gained. By 1869‚ 63 elements had been discovered in total. Scientists began to categorise those elements according to the similarities of their physical and chemical properties‚ which become the
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of magnitude by doping. Semiconductors have electrical resistivities between 10-5 and 107 ohms. (Brown 956) Semiconductors can be crystalline or amorphous. Elemental semiconductors are simple-element semiconductor materials such as silicon or germanium. Silicon is the most common semiconductor material used today. It is used for diodes‚ transistors‚ integrated circuits‚ memories‚ infrared detection and lenses‚ light-emitting diodes (LED)‚ photosensors‚ strain gages‚ solar cells‚
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Introduction Generally‚ PET can be produced in two steps by one of two ways‚ called the DMT and the TPA processes‚ or the transesterfication and direct esterification routes‚ respectively. Since its commercialization in the 1950’s by DuPont‚ PET was predominantly synthesized out of DMT due to the fact that this monomer‚ compared to TPA‚ was relatively easily purified by distillation. Yet‚ since the 1960’s‚ purified TPA became available by the development of new technologies and gained a lot of importance
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Determining Photosynthetic Activity in Plants Using Different Wavelengths of Light and Pigmentation Abstract The roles played by light and pigmentation in photosynthesis were examined in the geranium and Coleus plant. In addition‚ the separation of certain pigments based on their molecular structure was also examined‚ with the use of paper chromatography. When different leaves of the geranium plant which were exposed to different wavelengths of light‚ photosynthesis proved to be most actively
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conductor such as copper and that of an insulatorsuch as glass. semiconductor is a material whose electrical conductivity is between that of a conductor and an insulator. The elements most commonly used in semiconducting devices aresilicon and germanium. A semiconductor is a solid substance that can conduct between an insulator and most forms of metal. There are not very many substances that can serve as semiconductors‚ but the semiconductor itself is a major player in most fields including computing
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The Element Argon Argon Argon was originally named after the Greek word “Argos‚” meaning inactive. Argon’s chemical symbol was just A before it was changed to Ar in 1957. It has an atomic number of 18‚ and is in Period 3‚ Group 18. Argon contains 18 protons and 18 electrons with 22 neutrons. It has an atomic mass of 39.948. Suspected to be present in the atmosphere in 1785 by Henry Cavendish‚ Argon
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single piece of semiconductor material half the size of a paper clip." On September 12‚ 1958‚ history was made in a TI laboratory after he successfully demonstrated the ability of that first microchip. Mr. Kilby showed the TI management a piece of germanium with an oscilloscope attached‚ turned it on‚ and the oscilloscope demonstrated a continuous sine wave‚
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