Nineteen elements – including gold, arsenic, fluorine, cadmium, molybdenum and thorium – have been assigned new atomic weights, according to the IUPAC’s Commission on Isotopic Abundances and Atomic Weights. Periodic table of the elements (University of California, Irvine). The importance of determining precise atomic weights has long been recognized, resulting in the creation of the International Atomic Weights Committee in 1899. International...
