Back Isotope van meitnerium Afrikaans Isòtops del meitneri Catalan Izotopy meitneria Czech Мейтнери изотопĕсем CV Anexo:Isótopos de meitnerio Spanish ایزوتوپهای مایتنریم Persian Isotopes du meitnérium French A meitnérium izotópjai Hungarian Isotop meitnerium ID マイトネリウムの同位体 Japanese
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Meitnerium (109Mt) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be synthesized was 266Mt in 1982, and this is also the only isotope directly synthesized; all other isotopes are only known as decay products of heavier elements. There are eight known isotopes, from 266Mt to 278Mt. There may also be two isomers. The longest-lived of the known isotopes is 278Mt with a half-life of 8 seconds. The unconfirmed heavier 282Mt appears to have an even longer half-life of 67 seconds.
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