Periodic Table

http://www.chem.qmul.ac.uk/iupac/AtWt/table.html

World Wide Web version prepared by G. P. Moss

Department of Chemistry, Queen Mary University of London,
Mile End Road, London, E1 4NS, UK
g.p.moss@qmul.ac.uk

This version of the Periodic table is based on that recommended by the Commission on the Nomenclature of Inorganic Chemistry and published in IUPAC Nomenclature of Inorganic Chemistry, Recommendations 1990. Atomic weights are quoted to five significant figures. For more precise values see the table of 2001 recommended values (see Pure Appl. Chem., 2003, 75, 1107-1122). The names of elements 104-109 were agreed in 1997 (see Pure Appl. Chem., 1997, 69, 2471-2473). For elements with no stable nuclides the mass of the longest-lived isotope has been quoted in brackets. However three such elements (Th, Pa, and U) do have a characteristic terrestrial isotopic composition, and for these an atomic weight is tabulated. The names for elements 112 to 114 are temporary and are based on the 1978 recommendations (see Pure Appl. Chem., 1979, 51, 381-384). The approved symbol for element 110 (see Pure Appl. Chem., 2003, 75, 1613-1615) and the approved name for element 111 (see Pure Appl. Chem., 2004, 76, 2101-2103) are included. A report in Phys. Rev. C, 2004, 69, 021601(R) claims the detection of elements 113 and 115.


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