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Americium is a silvery-white synthetic metal. It slowly tarnishes in dry air, but it is resistant to alkalis. It is denser than lead. Several americium compounds have been made and these are generally coloured – for example, the chloride is pink.
Americium has some uses – it is used in some smoke detectors, as portable gamma ray source in radiography, to help to create flat glass. However this isotope is extremely expensive to produce in usable quantities.