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Contents. Isotopes of curium. Curium (96 Cm) is an artificial element with an atomic number of 96. Because it is an artificial element, a standard atomic weight cannot be given, and it has no stable isotopes. The first isotope synthesized was 242 Cm in 1944, which has 146 neutrons. There are 19 known radioisotopes ranging from 233 Cm to 251 Cm.
All known isotopes of curium are radioactive and have small critical mass for a nuclear chain reaction. The most stable isotope, 247 Cm, has a half-life of 15.6 million years; the longest-lived curium isotopes predominantly emit alpha particles .
Pages in category "Isotopes of curium" The following 22 pages are in this category, out of 22 total. This list may not reflect recent changes. ...
Bombarding curium-242 with α-particles resulted in an isotope of californium 245 Cf in 1950, and a similar procedure yielded berkelium-243 from americium-241 in 1949. [42] The new elements were named after Berkeley, California , by analogy with its lanthanide homologue terbium , which was named after the village of Ytterby in Sweden.
Radioactive isotope table "lists ALL radioactive nuclei with a half-life greater than 1000 years", incorporated in the list above. The NUBASE2020 evaluation of nuclear physics properties F.G. Kondev et al. 2021 Chinese Phys. C 45 030001. The PDF of this article lists the half-lives of all known radioactives nuclides.
Water (H2O) is a polar inorganic compound that is at room temperature a tasteless and odorless liquid, which is nearly colorless apart from an inherent hint of blue. It is by far the most studied chemical compound [ 20 ] and is described as the "universal solvent " [ 21 ] and the "solvent of life". [ 22 ]
About 18 isotopes and 11 nuclear isomers are known for americium, having mass numbers 229, 230, and 232 through 247. [3] There are two long-lived alpha-emitters; 243 Am has a half-life of 7,370 years and is the most stable isotope, and 241 Am has a half-life of 432.2 years.
Also, a number of ternary oxides of the type M(II)CmO 3 are known, where M stands for a divalent metal, such as barium. Thermal oxidation of trace quantities of curium hydride (CmH 2–3) has been reported to give a volatile form of CmO 2 and the volatile trioxide CmO 3, one of two known examples of the very rare +6 state for curium.