Al is resistant to water-corrosion and will only corrode in acid-based conditions (pH<7).
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Aluminum can be treated by anodization to create an inert hard protective layer over the surface. This layer can be either transparent or by the addition of tiny amounts of dopant elements during the process a wide range of colorscan be produced.Even without anodization, a bare aluminum surface is so reactive that a layer of transparent aluminum oxide rapidly builds preventing further reaction.But do not use aluminum utensils with acidic foods or scrub with abrasives when cleaning, this will remove anodization or the natural oxide protection leaving the bare reactive metal again.
Many vehicles and 70-90% aluminum these days.
Because it's relatively cheap, and light. Most electric kettles these days are however, made from plastic or stainless steel as they last longer (aluminium is attacked by the salt in many water supplies). Aluminium has also been implicated in Alzheimer's Disease which is why stainless steel is much more common in cookware these days.
Ultrapure aluminium contain only aluminium atoms.
Aluminium will corrode easily with salt water or water in the atmosphere. There are many ways to stop it corroding, one of which is painting it. Paint will provide some corrosion resistance but will not help a lot if it is going to be going through a lot of wear and tear, as the paint will be scraped off and leave no protection. Another method is to just let the aluminum be in contact with air and it will almost instantly form a very thin layer of Al2O3 which then allows very little corrosion to occur, and if the Al2O3 is somehow removed it will almost instantly reform to provide resistance again.
The neutral atom of aluminium has 13 electrons.
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The chemical formula of aluminium oxide is Al2O3: five atoms.
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Like many other fighter aircraft of that period, Spitfires were made from an aluminium frame and skinned with an aluminium alloy called 'dural'.