1 Jan 1869 Jahr - DMITRI MENDELEEV (1834-1907 CE) date of discovery (1869 CE) Created the first periodic table that arranged the known elements according to their of atomic mass and organized them into groups possessing similar properties. His periodic table predicted the existence of three new elements (gallium, scandium, and germanium) and when these elements were discovered, they fit correctly into the three missing elements in his table.
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1 Jan 1869 Jahr
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~ 156 years ago