A substance with electrical properties between those of a good conductor and those of a good insulator.They often produced by dopping. Intrinsic Semi Conductors Intrinsic semiconductors are composed of only one kind of material. Silicon and germanium are two examples. They are also called "undoped semiconductors" or "i-type semiconductors". Extrinsic Semi Conductors Extrinsic semiconductors are made of intrinsic semiconductors that have had other substances added to them to alter their properties
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copper‚ iron Definition: Insulator -a material in which electric charges do not move freely -i.e. plastic‚ rubber Definition: Semiconductors -materials having electrical properties between those of conductors and insulators -i.e. silicon‚ germanium Definition: grounded -when a conductor is connected to the Earth by a conducting wire Definition: induction (inducing a charge) -charging an object without coming into contact with it Definition: conduction (conducting a charge) -charging
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Wood Ear Mushroom for Promoting a Healthy Diet When you think about mushrooms‚ you typically get the classic image of a mushroom right before your eyes. Well‚ this changes when you see the Wood Ear Mushroom‚ which is rather different in shape and appearance than other mushrooms are. It tends to be roughly shaped like a cup or ear and it is characterized by a rubbery texture. Its name is Auricularia polytricha‚ but this mushroom is also known as black fungus‚ wood ear‚ Judas ear‚ cloud ear or tree
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electrical and electronic applications. These are called insulators. There is another category of materials whose ability to carry current‚ called conductivity‚ lies between that of conductor and insulators. Such materials are known as semi conductors. Germanium and silicon are two well-known semiconductors. 1.2 Atoms and elements Ordinary matter is made up of protons‚ neutrons‚ and electrons and is composed of atoms. An atom consists of a tiny nucleus made up of protons and neutrons‚ on the order
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Neutrons = 29.85 f) 39.95 = 18 + Neutrons 39.95 – 18 = Neutrons Neutrons = 21.95 QUESTION 2 Using the abbreviated quantum number notation (s‚p‚d‚f) write the electronic configuration of the following elements. a) Silicon b) Germanium c) Silver d) Sodium e) Calcium f) Molybdenum Answer:- a) Full configuration: 1s2 2s2 2p6 3s2 3p2 Noble Gas form: Ne 3s2 3p2 b) Full configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p2 Noble Gas form: Ar 3d10 4s2 4p2
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The Disappearing Spoon by Sam Kean Chapters 1-3 Summary The periodic table is composed of eighteen columns and seven horizontal rows‚ with two additional rows underneath. There is grand total of 112 elements in the periodic table‚ each of which is placed in a designated spot on the table and cannot be moved. Different areas on the table have elements that are made of different components. Elements that are in the same column are more similar than elements in the same horizontal row. Seventy five
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microchips made? By definition the integrated circuit aka microchip is a set of interconnected electronic components such as transistors and resistors‚ that are etched or imprinted on a onto a tiny chip of a semiconducting material‚ such as silicon or germanium. The History of the Integrated Circuit Jack Kilby and Robert Noyce It seems that the integrated circuit was destined to be invented. Two separate inventors‚ unaware of each other’s activities‚ invented almost identical integrated circuits
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Periodic Table. Elements classified as Metalloids have properties of both metals and non-metals. Some are semi-conductors and can carry an electrical charge making them useful in calculators and computers The Metalloids are: Boron Silicon Germanium Arsenic Antimony Tellurium Polonium Elements classified as Alkali Metals The 6 elements classified as "Alkali Metals" are located in Group 1 elements of the Periodic Table. Elements classified as Alkali Metals are very reactive metals that
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Silicon is a chemical element with the symbol Si and atomic number 14 and atomic mass is 28. It is a tetravalent metalloid‚ less reactive than its chemical analog carbon‚ the nonmetal directly above it in the periodic table‚ but more reactive than germanium‚ the metalloid directly below it in the table. Controversy about silicon’s character dates to its discovery; it was first prepared and characterized in pure form in 1823. In 1808‚ it was given the name silicium‚ with an -ium word-ending to suggest
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CONTENTS CONTENTS + 0 ) 2 6 - 4 Learning Objectives ➣ P-N Junction Diode ➣ Derivation of Junction Resistance ➣ Junction Breakdown ➣ Junction Capacitance ➣ Equivalent Circuit of P-N Junction ➣ Diode Fabrication # P-N JUNCTION DIODE ➣ Grown Junction ➣ Alloy Junction ➣ Diffused Junction ➣ Epitaxial Junction ➣ Point Contact Junction ➣ The Ideal Diode ➣ The Real Diode ➣ Diode Circuits with D.C. and A.C. Voltage Sources ➣ Diode Clipper and Clamper Circuits ➣ Clippers
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