CHEMISTRY


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Homework** 1. In the case of alloys its importance is that for some special applications, a metal by itself can not meet certain requirements and therefore it is necessary to combine it with another. An example can be the Stainless steel (steel by itself can not be used in hospitals because it is oxidized and this oxidation can stay and breed bacteria) 2. Now, the plastics is important because it can be recycle, and recycling helps to the environment because it helps to stop the contamination, without the recycling of plastic some products couldn’t be disposable. 3. the polymers are important because now a days all the things around us are made up of polymers, so without it we couldn’t have all this things. Some new materials in medicine (inorganic materials) are alloys, materials of carbon, glass ceramics and metals. alloyspolymers

Name: Dysprosium Symbol: Dy Atomic Number: 66 Name Origin: From the Greek word //dysprositos// (hard to get at) Discovered: in 1886 by P.-E. Lecoq de Boisbaudran Electronic Configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 5s2 4d10 5p6 6s2 4f8 Atomic Radius: 178pm Ionization energy: 571.9 kJ/mole Electron affinity: 50 kJ/mole Electronegativity: 1.2 > Dave Hamric sells element samples under the name Metallium. He's developed a line of coins struck out of various common and uncommon metals: They are quite lovely, and very reasonably priced, considering the difficulty of creating some of them. Sources: [] [] []
 * Webquest!!**
 * Dysprosium compounds are used in the coatings of many hard disk drives to record digital data as field orientations in nanoscale magnetic domains. Other than that, dysprosium has few applications.
 * Element coin.