Americium
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Americium is a chemical element in the periodic table with the symbol Am and atomic number 95. All isotopes of this man-made element are radioactive. It belongs to the group of the actinides. It was named for the Americass, by analogy with europium.
Americium has found its way into the household, where one type of smoke detector contains a tiny amount of Am-241 as a source of ionizing radiation.