subatomic particles that play the greatest role in cellular chemical reactions are electrons. protons. neutrons. isotopes. 0 out of 5 The correct answer is: electrons. Question 2 of 20 The structural unit that retains the properties of an element is the molecule. atom. cell. electron. 5 out of 5 Correct!! Question 3 of 20 Which of the following are found in the nucleus of an atom? Protons Neutrons Electrons A and B 0 out of 5 The correct answer is: A and B Question 4 of 20 The component
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electricity is the electric current resulting from the existence of charged particles such as electrons or protons. Electricity figures everywhere in our lives. Electricity lights up our homes‚ cooks our food‚ powers our computers‚ television sets‚ and other electronic devices. Electricity from batteries keeps our cars running and makes our flashlights shine in the dark. Here’s something you can do to see the importance of electricity. Take a walk through your school‚ house or apartment and write
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Describe the difference between a mixture and a compound. A compound is a substance in which atoms of different elements are chemically held to one another. A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs. A mixture can usually be separated back into its original components‚ a compound cannot. Below are some examples of the differences between each. Compounds •Compounds are pure substances. •They are made up of two or more
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poor conductor of electricity. If the electrons in an atom can’t be moved from their orbits at all‚ the material is an insulator. If at least some of the electrons can be moved‚ the material is a resistor. Two of the best-known conductors of electricity are silver and copper. The atomic structures of the silver and copper atom are compared in Figure 6. Note that both atoms have only one electron in the outermost orbit. This makes silver and copper excellent conductors of electricity. Silver
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Free Electron model can. Explains the effects of the temperature‚ impurities‚ and deformation on Electrical Conductivity in which the Drude Model can’t explain. List two aspects of materials behaviour that the Drude and QFE models can’t explain but that Band Theory can. The Band Theory can explain why the outer electrons become delocalised and the semi conductivity. [2 marks for each part] 2 Using the Drude model‚ for platinum‚ calculate the number of delocalised electrons per
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contact When two objects are rubbed together there is more contact between the surfaces and so more electrons are transferred Electron Affinity: Electron affinity is the tendency of a substance to hold onto electrons. Items high on the list (electrostatic/ triboelectric series) will tend to lose electrons easily (positive) Items low on the list will tend to gain electrons easily‚ or hold on to their electrons example: glass rubbed with plastic wrap glass is above plastic wrap glass will become positive
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A Seminar Report On “Spintronics Technology” Session 2010-2011 Submitted To: Submitted By: Dr. R.S. Meena Mr. Pankaj Shukla Dept. of Electronics Engg. UCE‚ RTU‚ Kota Shailendra Kumar Singh C.R.No. 07/126 Final Year‚ ECE UCE‚ RTU‚ Kota Department of Electronics and Communication Engg. University College of Engineering Rajasthan Technical University‚ Kota Page 1 CERTIFICATE This is certify that the Seminar report titled “Spintronics Technology” has been submitted
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in Quantumland 1. Electrons have no distinguishing features except spin Upon falling into the quantum wonderland while in her living room‚ Alice finds herself faced with a new reality of existence that seems to baffle her. She is first met with some strange-looking dweller of the new and vastly strange wonderland that she could not make out. She politely introduces herself as Alice‚ thereby invoking a response from her companion to the effect that it was an electron. Alice also noted that
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|8 | |What is an orbital? |9 | |Discovery of electron‚ proton and neutron |12 | |Chapter 7 Chemical bonding: ionic bonding
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They name for these beta rays was soon replaced by the name electron. The English physicist by the name of JJ Thomson‚ discovered the electron in 1897. He was certain that every atom consisted of electrons. He deduced that since an atom contains a neutral charge and consists of negative electrons‚ there must be some other positively charged material within the atom to balance out the negatively charged electrons. He realized that the electrons alone could not account for the mass of one atom due to
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