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  • Periodic Table of Elements - PubChem
    Interactive periodic table with up-to-date element property data collected from authoritative sources Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game!
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    Geochronology and Thermochronology by the 40Ar 39Ar Method, p 212, Oxford University Press, Oxford (1999) [170] United States Geological Survey Periodic Table-Argon, U S Geological Survey (2014), Feb 25; http: wwwrcamnl wr usgs gov isoig period ar_iig html [171] B E Lehmann, R Purtschert Appl Geochem 12, 727 (1997)




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