91 actinium 14012 thorium 14091 protactinium 14424

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Unformatted text preview: Rf Db Sg Bh Hs Mt Ds Uuu Uub [262] lanthanum *lanthanoids Ta In Kr 88.906 lutetium 87.62 barium 55 Y Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br 90 91 92 93 94 95 96 97 98 99 100 101 102 Ac Th Pa [227] 232.04 231.04 U 238.03 Np Pu Am Cm Bk Cf Es Fm Md No [237] [244] [243] [247] [247] [251] [252] [257] [258] [259] Symbols and names: the symbols and names of the elements, and their spellings are those recommended by the International Union of Pure and Applied Chemistry (IUPAC - http://www.iupac.org/). Names have yet to be proposed for the most recently discovered elements 111–112 and 114 so those used here are IUPAC’s temporary systematic names. In the USA and some other countries, the spellings aluminum and cesium are normal while in the UK and elsewhere the common spelling is sulphur. Group labels: the numeric system (1–18) used here is the current IUPAC convention. Atomic weights (mean relative masses): Apart from the heaviest elements, these are the IUPAC 2001 values and given to 5 significant figures. Elements for which the atomic weight is given within square brackets have no stable nuc...
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