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The quantities of fermium produced in 20–200 kiloton thermonuclear explosions is ... the half-life of 249 Cm (64 minutes) is much too short for months-long ...
This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.
Fermium (100 Fm) is a synthetic element, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be discovered (in fallout from nuclear testing) was 255 Fm in 1952. 250 Fm was independently synthesized shortly after the discovery of 255 Fm.
Francium-223 is the most stable isotope, with a half-life of 21.8 minutes, [8] and it is highly unlikely that an isotope of francium with a longer half-life will ever be discovered or synthesized. [22] Francium-223 is a fifth product of the uranium-235 decay series as a daughter isotope of actinium-227; thorium-227 is the more common daughter. [23]
Scientists found that if all people boosted their activity to 160 minutes daily, they could increase their life expectancy over five years. Experts explain how walking can benefit your health.
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“We have discovered that next step on a pathway to life.” This mosaic image of asteroid Bennu, was taken on December 2, 2018 by the OSIRIS-REx spacecraft from a range of 15 miles.
Additional analysis and further experimentation showed the produced mendelevium isotope to have mass 256 and to decay by electron capture to fermium-256 with a half-life of 157.6 minutes. [4] We thought it fitting that there be an element named for the Russian chemist Dmitri Mendeleev, who had developed the periodic table.