Isotopes of americium

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Americium (95Am) is an artificial element, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no known stable isotopes. The first isotope to be synthesized was 241Am in 1944. The artificial element decays by ejecting alpha particles.

Excerpt from the Wikipedia article “Isotopes of americium”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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