Which Russian chemist is credited with formulating the Periodic Law and creating the first Periodic Table of Elements?
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Mendeleev organized elements by atomic weight in 1869, leaving empty gaps for elements that had not yet been discovered. He correctly predicted the properties of these missing elements, such as gallium and germanium, years before they were actually found by other scientists. Photo: Original: Unknown authorUnknown author Upload: Germansociety2014, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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