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Date: 2003-11-07 16:44:24Stoichiometry Mass Amount of substance Atomic weight Chemical element Atomic mass Symbol Roentgenium Caesium Chemistry Periodic table Chemical properties | IUPAC Periodic Table of the Elements 1 18Add to Reading ListSource URL: old.iupac.orgDownload Document from Source WebsiteFile Size: 16,36 KBShare Document on Facebook |