often used for the production of medical As and Se radioisotopes. Ge-74 is used in the production for As-74‚ Ge-76 is used for the production of As-77‚ Ge-74 for the production of As-73 and Ge-72 for As-72 (Germanium Element). The atomic number for germanium is 32. It’s atomic mass is 72.59 g. Mol -1. The electronegativity for germanium is 1.8. The density of germanium is 5.3 g.cm-3 at 20o Celsius. Germanium also has a melting point of 937o Celsius. Its boiling point is 2830o Celsius
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the things that are made of europium have some type of an accent or unusual way to say or spell it. Most LCD TVs are sourced by Europium which gives off a clear and better colorful picture than televisions made in the 1990’s. The atomic mass is 151.96. To find the atomic mass of an element‚ first they have to see how many protons and neutrons contained. There are 63 electrons and protons in Europium and 89 neutrons. Now this item is not something that you can easily pick up anywhere. You’ll have to
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A ‘clock’ is an instrument used to specify‚ record‚ and manage time. The word ‘clock’ comes from the French word “cloche” meaning bell‚ came into use when timekeepers were kept in bell towers in the Middle Ages. Historians do not who or when mankind “invented” a time-keeping device or a “clock”. Probably thousands of years ago when someone stuck a stick in the ground and saw a shadow of the sun move across the ground‚ known as the sundial. (Cummings‚ 1997-2012). After the Samarian culture
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had so much of fun in shimla and also great Essays for Science: Chemistry Building Blocks of Science THE periodic table of the elements—the 96 metals‚ nonmetals and gases that form everything in the material universe— is the blueprint of the atomic future... Calorimetry: Specific Heat and Heat of Solution Summary These experiments were conducted to find the specific heat of a metal as well as the heat of solution of a solid. Both experiments required the use of calorimetry... Clean Coal
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................................................................... ...................................................................................................................................... [1] Q2 An atom has an atomic number of 17 and a relative atomic mass of 35. (a) Determine the number of protons and neutrons in the nucleus of this atom Protons
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Dalton came in…..2000 years later. Dalton used experimental methods to changed Democritus’s idea into a scientific theory. Dalton then began analyzing the ratios in which elements merge in chemical reactions. After doing several experiment‚ Dalton’s atomic theory was created. The four parts of his theory – as seen on page 103 in your Pearson Chemistry textbook - can be found
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"Diffusion - How atoms move through solids" Diffusion means mass transport by atomic motion. The mechanisms of Gases & Liquids is known as random (Brownian) motion and for solids is known vacancy diffusion or interstitial diffusion. Simply we can define diffusion as‚ the movement of particles in a solid from an area of high concentration to an area of low concentration‚ resulting in the uniform distribution of the substance. (Diffusion chapter 5‚ 2008‚ p.1) Ronald D. Kriz(1999) suggests that
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BSC 1020 – Homework Unit B The Molecules of Life This homework is worth 25 points of the 900 points available in the course. Please use the book‚ PPT lecture handouts‚ and internet to answer the following six questions: Question 1 (8 points) Mr. Tony‚ a biology teacher‚ gives his student Ziad four samples and tells him they are lysine (an amino acid)‚ lactose (a disaccharide)‚ insulin (a protein hormone)‚ and RNA. The samples are in test tubes marked 1‚ 2‚ 3‚ and 4‚ but Ziad is
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Beryllium Atomic Symbol:Be Atomic number:4 Atomic Mass:9.012182 g History Of Beryllium In early Ancient Civilizations‚ the substances of emerald and beryl were first recognized as the same substances. but in late 1798‚ French chemist Louis-Nicholas Vauquelin found out that the unknown element in the two substances was known as beryllium. Beryllium is obtained from the substances beryl and bertrandite by using chemical processes.(1) The first metal form was produced by Wohler and Bussy in 1828.
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Yafaa Chaudhary PHYSICS 5 NOTES Physics 5 3.5.1 Radioactivity Evidence for the nucleus Qualitative study for the Rutherford scattering. Rutherford directed a narrow beam of α-particles‚ all of the same kinetic energy‚ in an evacuated container at a thin gold film‚ in order to identify the structure of an atom: The α-particles need to be of the same kinetic energy otherwise slow α-particles would be deflected more than faster α-particles on the same initial path. The container needs to be evacuated
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