The International Unit of Pure and Applied Chemistry have found new atomic masses for 19 different elements. As technology is advancing the scientists are able to figure out more in depth things about different elements. The 19 elements have either gained or lost weight. The atomic mass was thought to be a stable weight but as they find new sources of the element the ratio between the isotopes change. The latest weight change had been for the elements selenium and molybdenum. Selenium gained .011 atomic mass units and Molybdenum has lost.01 atomic mass units. As technologies increase the periodic table might change drastically. Scientists might find something different that just has to be on the periodic table. Things are changing really quickly!
http://www.rsc.org/chemistryworld/2013/09/element-weights-redefined
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