Item talk:Q309051

From geokb

{

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   "@type": "Article",
   "additionalType": "Journal Article",
   "name": "Standard atomic weights of the elements 2021 (IUPAC Technical Report)",
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       "value": "10.1515/pac-2019-0603",
       "url": "https://doi.org/10.1515/pac-2019-0603"
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   "journal": {
     "@type": "Periodical",
     "name": "Pure and Applied Chemistry",
     "volumeNumber": "94",
     "issueNumber": "5"
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   "inLanguage": "en",
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   "datePublished": "2022",
   "dateModified": "2022-08-31",
   "abstract": "Following the reviews of atomic-weight determinations and other cognate data in 2015, 2017, 2019 and 2021, the IUPAC (International Union of Pure and Applied Chemistry) Commission on Isotopic Abundances and Atomic Weights (CIAAW) reports changes of standard atomic weights. The symbol\u00a0A\u00a0r\u00b0(E) was selected for standard atomic weight of an element to distinguish it from the atomic weight of an element E in a specific substance P, designated\u00a0A\u00a0r(E, P). The CIAAW has changed the values of the standard atomic weights of five elements based on recent determinations of terrestrial isotopic abundances:Ar (argon):from 39.948\u00a0\u00b1\u00a00.001to[39.792, 39.963]Hf (hafnium):from 178.49\u00a0\u00b1\u00a00.02to178.486\u00a0\u00b1\u00a00.006Ir (iridium):from 192.217\u00a0\u00b1\u00a00.003to192.217\u00a0\u00b1\u00a00.002Pb (lead):from 207.2\u00a0\u00b1\u00a00.1to[206.14, 207.94]Yb (ytterbium):from 173.054\u00a0\u00b1\u00a00.005to173.045\u00a0\u00b1\u00a00.010The standard atomic weight of argon and lead have changed to an interval to reflect that the natural variation in isotopic composition exceeds the measurement uncertainty of\u00a0A\u00a0r(Ar) and\u00a0A\u00a0r(Pb) in a specific substance. The standard atomic weights and/or the uncertainties of fourteen elements have been changed based on the Atomic Mass Evaluations 2016 and 2020 accomplished under the auspices of the International Union of Pure and Applied Physics (IUPAP).\u00a0A\u00a0r\u00b0 of Ho, Tb, Tm and Y were changed in 2017 and again updated in 2021:Al (aluminium), 2017:from 26.981\u00a05385\u00a0\u00b1\u00a00.000\u00a00007to26.981\u00a05384\u00a0\u00b1\u00a00.000\u00a00003Au (gold), 2017:from 196.966\u00a0569\u00a0\u00b1\u00a00.000\u00a0005to196.966\u00a0570\u00a0\u00b1\u00a00.000\u00a0004Co (cobalt), 2017:from 58.933\u00a0194\u00a0\u00b1\u00a00.000\u00a0004to58.933\u00a0194\u00a0\u00b1\u00a00.000\u00a0003F (fluorine), 2021:from 18.998\u00a0403\u00a0163\u00a0\u00b1\u00a00.000\u00a0000\u00a0006to18.998\u00a0403\u00a0162\u00a0\u00b1\u00a00.000\u00a0000\u00a0005(Ho (holmium), 2017:from 164.930\u00a033\u00a0\u00b1\u00a00.000\u00a002to164.930\u00a0328\u00a0\u00b1\u00a00.000\u00a0007)Ho (holmium), 2021:from 164.930\u00a0328\u00a0\u00b1\u00a00.000\u00a0007to164.930\u00a0329\u00a0\u00b1\u00a00.000\u00a0005Mn (manganese), 2017:from 54.938\u00a0044\u00a0\u00b1\u00a00.000\u00a0003to54.938\u00a0043\u00a0\u00b1\u00a00.000\u00a0002Nb (niobium), 2017:from 92.906\u00a037\u00a0\u00b1\u00a00.000\u00a002to92.906\u00a037\u00a0\u00b1\u00a00.000\u00a001Pa (protactinium), 2017:from 231.035\u00a088\u00a0\u00b1\u00a00.000\u00a002to231.035\u00a088\u00a0\u00b1\u00a00.000\u00a001Pr (praseodymium), 2017:from 140.907\u00a066\u00a0\u00b1\u00a00.000\u00a002to140.907\u00a066\u00a0\u00b1\u00a00.000\u00a001Rh (rhodium), 2017:from 102.905\u00a050\u00a0\u00b1\u00a00.000\u00a002to102.905\u00a049\u00a0\u00b1\u00a00.000\u00a002Sc (scandium), 2021:from 44.955\u00a0908\u00a0\u00b1\u00a00.000\u00a0005to44.955\u00a0907\u00a0\u00b1\u00a00.000\u00a0004(Tb (terbium), 2017:from 158.925\u00a035\u00a0\u00b1\u00a00.000\u00a002to158.925\u00a0354\u00a0\u00b1\u00a00.000\u00a0008)Tb (terbium), 2021:from 158.925\u00a0354\u00a0\u00b1\u00a00.000\u00a0008to158.925\u00a0354\u00a0\u00b1\u00a00.000\u00a0007(Tm (thulium), 2017:from 168.934\u00a022\u00a0\u00b1\u00a00.000\u00a002to168.934\u00a0218\u00a0\u00b1\u00a00.000\u00a0006)Tm (thulium), 2021:from 168.934\u00a0218\u00a0\u00b1\u00a00.000\u00a0006to168.934\u00a0219\u00a0\u00b1\u00a00.000\u00a0005(Y (yttrium), 2017:from 88.905\u00a084\u00a0\u00b1\u00a00.000\u00a002to88.905\u00a084\u00a0\u00b1\u00a00.000\u00a001)Y (yttrium), 2021:from 88.905\u00a084\u00a0\u00b1\u00a00.000\u00a001to88.905\u00a0838\u00a0\u00b1\u00a00.000\u00a0002",
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