Schools have Metal Detectors? Have you ever felt violated‚ disrespected and dishonored to the point of no return? Many students around the world feel such a way every day. According to a 2002 National School Board Association report‚ 10.1 percent of school districts nationwide implement the use of metal detectors. Are metal detectors even effective? Why should students be forced to cooperate with a violation of their rights? High Schools around the world should not employ the use of metal detectors
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A metal is defined as an opaque shiny element which possesses properties such as malleability and ductility. Malleable meaning that they can be hammered into shapes and ductile meaning they can be drawn into wires. They are also very strong and posses high tensile strength and are good conductors of heat and electricity. Metals are shiny‚ and also have high densities. Metals are a very important and significant part of chemistry. However‚ their importance is not just limited to chemistry; they are
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: Let’s now start by looking at the basic requirements for selecting materials that are suitable for a particular application. For example figure 1 shows a connecter joining electric cables. The plastic casing has been partly cut away to show the metal connector. Plastic is used for the outer casing because it is a good electrical insulator and prevents electric shock if a person touches it. It also prevents the conductors touching each other and causing a short circuit. As well as being a good insulator
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things change over the course of history‚ the chemical and physical properties of silver and any other element do not. Silver was not only used in Ancient Times‚ but throughout the Bible as well. Considered a precious metal since Ancient times‚ the element Silver is one of the earliest metals known to humans. While studying the element silver‚ it is import to look it’s properties‚ how it’s prepared‚ along with it’s use and value in both Ancient/Biblical times and present. The element silver
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▪ The element name is osmium and its elemental symbol is Os. Its atomic mass is 190.23 2. What is the elements atomic number‚ what class of elements does it fall into ▪ The atomic number for osmium is 76. Osmium falls into the transition metal group. 3. Are there any common isotopes of this element? ▪ Yes 4. Describe when‚ by whom and how the element was discovered ▪ Osmium was discovered in 1803 in England by Smithson Tennant. He discovered osmium in residue
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times the mass of all the heavier elements‚ combined. 3. Lithium Name: Lithium Atomic number: 3 Atomic Weight: 6.941 grams/mole Group in periodic table: 1 Group name: Alkali metal Color: Silvery white/grey Lithium is solid only about half as dense as water and lithium metal is the least dense metal. Lithium is known as losing its electron‚ so it becomes Li+. Lithium is mixed with aluminum and magnesium for light-weight alloys and is used in batteries‚ some greases‚ some glasses‚ and
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Study of Gold metal Date: 14/01/2013 Submitted to: Dr Sami Habib Submitted by: Jamil Mahfoud (A1010659) I- General introduction about metals: a- Historical background Back to 6000 BC‚ process metallurgy is known as one of the oldest applied sciences. Despite that the form of metals was very basic but it has a big impact on the society because of its wide uses especially as tools for agriculture or hunting and even as artistic styles later on. There are 86 known metals so far that were
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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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OrOn a Self-Recovering Coherer and the Study of the Cohering Action of Different Metals JAGADIS CHUNDER BOSE Proceedings and List of Papers Read April 27‚ 1899 The Lord Lister‚ F.R.C.S.‚ D.C.L.‚ President‚ in the Chair. A List of the Presents received was laid on the table‚ and thanks ordered for them. The following papers were read: I) “Data for the Problem of Evolution in Man. I. A First Study of the Variability and Correlation of the Hand‚” by Miss M. A. Whiteley‚ B.Sc.‚ and Karl Pearson‚
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determine challenging structures. Widely used by both specialists and non-specialists‚ XAS is a mature technology that is also enabling the advancement of new areas of science. Examples • identification of therapeutic target sites‚ such as the metal-binding sites that may be responsible for some of the pathological effects of Alzheimer’s disease • elucidation of the chemistry associated with enzyme catalysis‚ particularly in relation to the influence of redox or charge state on the electronic
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