resistant and other are radioactive. Copper known as a transition metal and located in the eleven’s column and on the fourth period in periodic table. It has 4 shells and in the valence shell there are 11 electrons. Copper has 1 s orbital electron and full d-orbital‚ which explains the ability being ductile and conductivity. According to physical properties‚ copper is reddish brown metal. It has very high melting and boiling points‚ which are 1083⁰C and 2595⁰C. The density of metal is 8.96 g·cm−3
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Dr. Bolaños CHEM 110 - Exam #3 Fall 2010 Student Number _____________________ Name:________KEY_____________________________ There are 11 questions totaling 104 points (8 pages). PLEASE look over the entire examination BEFORE you begin to ensure your packet is complete. REMEMBER: The best place to start your exam may not be at the beginning! You have 2 hours to complete this examination and may only use a basic scientific calculator and the periodic table provided. All work must be shown
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absorb the extra energy given by the photon. In order for the energy to be absorbed‚ the difference in electrons must be the same; there must be positions for extra electrons in the orbitals of the atom. X-ray photons have a large amount of energy; only large atoms (where there are larger energy differences between orbitals) are able to absorb the energy. It is unlikely for smaller atoms to absorb this much energy. Our body tissues consist mainly of smaller atoms so x-ray photons are not absorbed. The
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Cosmos – an alternative name for the universe Meridian – a half circle extending from your horizon (altitude 0) due south through your zenith to your horizon due north. Zenith – the point directly overhead‚ which has an altitude of 90 degrees. Latitude –The angular north-south distance between Earth’s equator and a location on Earth’s surface. Longitude – The angular east-west distance between the prime meridian (which passes through Greenwich) and a location on Earth’s surface. Speed – The
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www.jntuworld.com Satellite Communications Reference book: Satellite Communications‚ 3rd ed. Dennis Roddy McGraw-Hill International Ed. www.jntuworld.com www.jntuworld.com 1.1 Introduction Features offered by satellite communications large areas of the earth are visible from the satellite‚ thus the satellite can form the star point of a communications net linking together many users simultaneously‚ users who may be widely separated geographically Provide communications links
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difference between them? The geocentric model was developed by Greek philosophers and was accepted for centuries. This model places the Earth at the orbital center of the universe with all the stars and planets circling around it. Geocentric actually means ‘Earth-centered’. The heliocentric model‚ which means ‘sun-centered’‚ places the Sun in the orbital center of the universe with all planets‚ including earth‚ circling around the Sun. This new model gradually replaced the geocentric model. It changed
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short-period comet‚ one with an orbit lasting 200 years or less. This contrasts it with long-period comets‚ whose orbits last for thousands of years. Most short-period comets‚ those with orbital periods shorter than 20 years and inclinations of 20–30 degrees or less‚ are called Jupiter family comets. Those like Halley‚ with orbital periods of between 20 and 200 years and inclinations extending from zero to more than 90 degrees‚ are called Halley type comets. Only 54 Halley-type comets have been observed
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Earth‚ and Moon are aligned (in "syzygy") exactly‚ or very closely so‚ with the Earth in the middle. Hence‚ a lunar eclipse can only occur the night of a full moon. The type and length of an eclipse depend upon the Moon’s location relative to its orbital nodes. Unlike a solar eclipse‚ which can only be viewed from a certain relatively small area of the world‚ a lunar eclipse may be viewed from anywhere on the night side of the Earth. A lunar eclipse lasts for a few hours‚ whereas a total solar eclipse
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Test Booklet Code - NO.: ABC 2216302 This Booklet contains 20 pages. Do not open this Test Booklet until you are asked to do so. Impoutant Instructions : 1. 2. The Answer Sheet is inside this Test Booklet. When you are directed to open the Test Booklet‚ take out the Answer Sheet and fill in the particulars on side-1 and side-2 carefully with blue/ black ball point pen only. The test is of 3 hours duration and Test Booklet contains 180 questions. Each question carries 4 marks
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when —SH is adsorbed to the Au surface; the hydrogen atom is dissociated and the strong Au—S covalent bond is formed subsequently. The electronic configuration of the palladium Pd(0) is represented by [Kr]4d105s0 [72]. We observe that the latest orbital 5s0 is free of electrons and it can accept two electrons‚ which can be provided by the free electronic doublet of deprotonated nitrogen atom of 2MBI molecule. This is in order to allow to Pd atom to have the stable configuration as [Kr]4d105s2. This
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