Who is credited with creating the first widely recognized periodic table in 1869?
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Dmitri Mendeleev organized elements by atomic mass and left gaps for undiscovered elements, predicting their properties with shocking accuracy. Julius Lothar Meyer developed a very similar system at the same time, but Mendeleev published first. Photo: Original: Unknown authorUnknown author Upload: Germansociety2014, Wikimedia Commons, Public domain.
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