High Quality Content by WIKIPEDIA articles! Tin (Sn) is the element with the greatest number of stable isotopes (ten) (three of them are potentially radioactive but have not been observed to decay), which is probably related to the fact that 50 is a "magic number" of protons. 29 additional unstable isotopes are known, including the "doubly magic" tin-100 (100Sn) (discovered in 1994) and tin-132 (132Sn). The longest-lived radioisotope is 126Sn with a half-life of 230,000 years. All other radioisotopes have half-lives less than a year.
High Quality Content by WIKIPEDIA articles! Francium (Fr) has no stable isotopes. A standard atomic mass cannot be given. Its most stable isotope is 223Fr with a half-life of 22 minutes, occurring in trace quantities as an intermediate decay product of 235U. The other natural isotope is 221Fr.
High Quality Content by WIKIPEDIA articles! There are 33 known isotopes of molybdenum (Mo) ranging in atomic mass from 83 to 115, as well as four metastable nuclear isomers. Seven isotopes occur naturally, with atomic masses of 92, 94, 95, 96, 97, 98, and 100. Of these naturally occurring isotopes, six (all but 100Mo) have never been observed to decay, but all are theoretically capable of radioactive decay. All unstable isotopes of molybdenum decay into isotopes of zirconium, niobium, technetium, and ruthenium.
High Quality Content by WIKIPEDIA articles! Radium (Ra) has no stable or nearly stable isotopes, and thus a standard atomic mass cannot be given. The longest lived, and most common, isotope of radium is 226Ra with a half-life of 1600 years. 226Ra occurs in the decay chain of 238U (often referred to as the radium series.) Radium has 35 known isotopes from 201Ra to 235Ra, with the newest being 235Ra.
High Quality Content by WIKIPEDIA articles! There are 39 known isotopes of radon (Rn) from 193Rn to 231Rn. The most stable isotope is 222Rn with a half-life of 3.823 days. Four isotopes, 218, 219, 220, 222Rn occur in trace quantities in nature as decay products of, respectively, 218At, 223Ra, 224Ra, and 226Ra. 218Rn and 222Rn are intermediate steps in the decay chain for 238U, 219Rn is an intermediate step in the decay chain for 235U and 220Rn occurs in the decay chain for 232Th.
High Quality Content by WIKIPEDIA articles! Naturally occurring xenon (Xe) is made of nine stable isotopes. (124Xe, 126Xe, 134Xe and 136Xe are predicted to undergo double beta decay, but this has never been observed, so they are considered to be stable.) Xenon has the second highest number of stable isotopes. Only tin, with 10 stable isotopes, has more. Beyond these stable forms, there are over 40 unstable isotopes and isomers that have been studied, the longest-lived of which is 127Xe with a half-life of 36.345 days. Of known isomers, the longest-lived is 131mXe with a half-life of 11.934 days. 129Xe is produced by beta decay of 129I (half-life: 16 million years); 131mXe, 133Xe, 133mXe, and 135Xe are some of the fission products of both...
High Quality Content by WIKIPEDIA articles! Americium (Am) is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 241Am in 1944.
High Quality Content by WIKIPEDIA articles! Ununtrium (Uut) is an artificial element, and thus a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 284Uut as a decay product of 288Uup in 2003. The first isotope to be directly synthesized was 278Uut in 2004. There are 6 known radioisotopes from 278Uut to 286Uut. The longest-lived isotope is 286Uut with a half-life of 19.6 seconds.
High Quality Content by WIKIPEDIA articles! Actinium (Ac) has no stable isotopes, thus a standard atomic mass cannot be given. There are 31 known isotopes, from 206Ac to 236Ac, and 2 isomers. Two isotopes are found in nature, 227Ac and 228Ac, as intermediate decay products of, respectively, 235U and 232Th. 228Ac is extremely rare, and almost all natural actinium is 227Ac.
High Quality Content by WIKIPEDIA articles! Itraconazole , invented in 1984, is a triazole antifungal agent that is prescribed to patients with fungal infections. The drug may be given orally or intravenously.
High Quality Content by WIKIPEDIA articles! John William Gofman (September 21, 1918 – August 15, 2007) was an American scientist and advocate. He was Professor Emeritus of Molecular and Cell Biology at University of California at Berkeley. Some of his early work was on the Manhattan Project, and he shares patents on the fissionability of uranium-233 as well as on early processes for separating plutonium from fission products. Dr. Gofman later worked in medicine and led the team that discovered and characterized lipoproteins in the causation of heart disease. In 1963, he established the Biomedical Research Division for the Livermore National Laboratory, where he was on the cutting edge of research into the connection between chromosomal...
High Quality Content by WIKIPEDIA articles! John Dongan (died 1413 x) was a medieval Manx prelate. After holding the position of Archdeacon of Down, he held three successive bishoprics, Mann and the Isles (Sodor), then the see of Derry and then, lastly, Down.
High Quality Content by WIKIPEDIA articles! Kepone, also known as chlordecone, is a carcinogenicinsecticide related to mirex, used between 1966 and 1975 in the USA for ant and roach baits.
High Quality Content by WIKIPEDIA articles! The Kesterson Reservoir is the name of a former unit of the Kesterson National Wildlife Refuge which is part of the current San Luis National Wildlife Refuge. The site gained national attention during the later half of the 20th century due to selenium toxicity and rapid die off of migratory waterfowl, fish, insects, plants and algae within the Kesterson Reservoir.