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Aluminum

Subject: Physics
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Aluminum is a metal that has the atomic number 13, it is silver white and has a density of 2.7 g / cm ³, it is only 1/3 of the iron density. Aluminum is the metal that is most of the earth's crust, there are no less than 8% aluminum. But it never occurs in pure form, but is always in different chemical compounds. Some examples of these compounds are minerals "feldspars", "mica" and "bauxite". Aluminum is also found in clay which is kaolinite Al2Si2O5 (OH) 4 It produces pure aluminum by making a "smelting" from bauxite. Bauxite is the compound most often produces aluminum from, bauxite consists in large parts of Aluminium hydroxide AlOOH, aluminum is energy intensive and therefore expensive to produce.

Aluminium is used for all sorts of things, such as airplanes and soda cans. However, aircraft aluminum with a protective "crust" when exposed to the elements, it becomes stronger from this. Because aluminum is a metal, it leads current well, it leads to and with so good to use it in 400k V's lines.

One should discard their old Coke cans in the vending machine, for aluminum can be used an infinite number of times, and the production of pure aluminum from old aluminum scrap is only 5% of the energy needed to produce new aluminum. Now recovered about 90% of all cans are made in Sweden. One should not just from an economic standpoint throw cans in the recycling, the fact is that at detT pH value below 4.3, the concentration of aluminum ions rapidly and can reach dangerous levels. Although aluminum is the most abundant element in the earth's crust, the ground is often aluminum ion content is low, it is because the aluminum compounds are poorly soluble in ordinary soil, therefore classed aluminum as a harmless metal. Aluminum is not as harmless as it is classified. It harms plant fine root hairs and therefore disturbs the plant water uptake. It can also harm humans, it is suspected that it may have damage to the nervous system and the brain of too much aluminum.

Here is a chart of what aluminum is used for. Packaging 34%, construction 13%, electricity. industry 14%, mek industry 11%, transportation 21%, other 4% and 3% of households.

Alumninium is in group 3, it is the same as for example Lives. It has kemsik mating Al and is in period 3, ie it has the same number of valence electrons, such as magnesium (Mg), here is a picture of how an aluminum atom may look

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