Alkali Metals Introduction Alkali metals refer to six elements belonging to the Group IA of the long form of the Modern Periodic Table‚ viz. Lithium (Li)‚ Sodium (Na)‚ Potassium (K)‚ Rubidium (Rb)‚ Cesium (Cs) and Francium (Fr). Fr is a radioactive element. These elements are called so because they form strongly alkaline oxides and hydroxides. Electronic Configuration of Alkali Metals Each of the alkali metals has one electron in their outermost (valence) shell‚ which is just outside an inert
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1. Introduction Blu-ray is a new optical disc standard based on the use of a blue laser rather than the red laser of today’s DVD players. The standard‚ developed collaboratively by Hitachi‚ LG‚ Matsushita (Panasonic)‚ Pioneer‚ Philips‚ Samsung‚ Sharp‚ Sony‚ and Thomson‚ threatens to make current DVD players obsolete. It is not clear whether new Blu-ray players might include both kinds of lasers in order to be able to read current CD and DVD formats. The new standard‚ developed jointly
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com/_pdf/mbqCref.pdf Adie‚ R.: On the corrosion of metals. 10 p. 1845. (In Minutes of proceedings of the Institution of Civil Engineers‚ v. 4‚ p. 323.) Shows that saturated salt solutions are a great protection from corrosion. Akerman‚ R.: Ueber das rosten des eisens. 4‚200 w. 1882. (In Stahl and eisen‚ v. 2‚ p. 417.) Considers theory of rusting‚ especially of protective metal coatings‚ and of the influence of manganese in the rusting of steel. Alford‚ H. Carroll: Corrosion of iron and its
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language‚ ate different foods‚ dressed differently‚ and lived a different lifestyle is a huge sacrifice in itself. Achieving the American dream was their goal. The two different views of America could change a whole country. The poster represents the "Melting Pot" America. The immigrants were to blend into the American culture and society. Rather than bringing their old country into America‚ and changing it. The poster is promoting to "Keep America Great‚" and "Learn the Language." The article states
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Types and benefits of Laser Skin Resurfacing Laser resurfacing is a procedure of skin resurfacing that makes the use of laser for treating minor flaws on your face or to enhance the skin appearance. It is usually done with two kinds of laser. One is ablative or wounding laser that eliminates thin skin layers and the other being a non-ablative or non-wounding laser that boosts the growth of collagen and tightens up the underlying skin. Non-ablative laser resurfacing being less invasive requires little
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Melting Point Determination Lab Materials: Graduated pipette Capillary tube Tin wipe Sample Melting temperature apparatus Thermometer Procedure: Take open end of capillary tube and tap it gently into sample. Take tin wipe and place over the opening. Gently tab it so the sample will funnel to the bottom of the tube. You may also use a graduated pipette to accomplish this. Now‚ place the capillary tube in the designated spot in the melting apparatus‚ and once placed‚ turn the apparatus
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Production and Properties of Metals Mr J E Chuter‚ Cert Ed 2012 En No 20100292 Introduction I have decided to produce a project based on the production and properties of metals‚ as although I have worked as a welder for over 30 years‚ and a welding teacher for the last 2 years on apart-time basis‚ I felt I didn’t know enough information on the material that I work on‚ on a daily
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What is laser retinal detachment surgery? How does the lasers work? What is retinal detachment? In the early 1970’s‚ laser were first used to treat eye diseases and has since then become the standard practise for formerly untreatable disorders. Even when there is haemorrhaging and leakage in the back of your eye‚ almost always‚ the eye will look and feel normal when suffering from retinal diseases. Therefore‚ the only way to conclude the necessity of laser surgery is to have a careful‚ dilated retinal
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While both laser therapy and scaling and root planing are both effective treatment methods for periodontal disease‚ scaling and root planing is used as a traditional method also called a deep cleaning while laser therapy is used as a relatively new alternative therapy. Both methods are usually used for patients who have periodontal disease with gingival pocket depths over 4mm. Though scaling and root planing has been the conventional treatment in the past‚ since 2008 laser therapy has doubled in
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involves a winner. There is always a good and bad side and one of them has to come out on top. In these two stories‚ “7th grade” and “The Melting Pot”‚ each have a winner or a resolution to the problem or conflict either an external or an internal. In “Seventh Grade”‚ the type of conflict is internal‚ because of all the sequences happening in Victor’s mind. In “The Melting Pot” the conflict is external because of all the sequences happening between the people of the town. In the story “Seventh Grade”‚ The
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