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In the periodic table, americium is located to the right of plutonium, to the left of curium, and below the lanthanide europium, with which it shares many physical and chemical properties. Americium is a highly radioactive element. When freshly prepared, it has a silvery-white metallic lustre, but then slowly tarnishes in air.
Americium-242m has a mass of 242.0595492 g/mol. It is one of the rare cases, like 108m Ag , 166m Ho , 180m Ta , 186m Re , 192m Ir , 210m Bi , 212m Po and others, where a higher-energy nuclear isomer is more stable than the ground state, americium-242 .
Americium-241 (241 Am, Am-241) is an isotope of americium. Like all isotopes of americium, it is radioactive , with a half-life of 432.2 years . 241 Am is the most common isotope of americium as well as the most prevalent isotope of americium in nuclear waste .
Americium trihydride is a binary inorganic compound of americium and hydrogen with the chemical formula AmH 3. [2] [3] [4] Physical properties
Physical properties; Phase at ... Spectral lines of americium: Other properties; Natural occurrence: synthetic: Crystal structure
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Americium(III) oxide or americium sesquioxide is an oxide of the element americium. It has the empirical formula Am 2 O 3. Since all isotopes of americium are only artificially produced, americium (III) oxide has no natural occurrence. The colour depends on the crystal structure, of which there are more than one.
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