International Union of Pure and Applied Chemistry

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Gold, 18 Elements Get a New Atomic Weight

Along with 18 other elements

(Newser) - Scientists made a weighty announcement this week: 19 elements on the Periodic Table, including gold, arsenic, and aluminum, have been assigned new atomic weights. Remember the glory days when cadmium was 112.411(8) atomic mass units? No longer. The International Union of Pure and Applied Chemistry says it's now... More »

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