|He was a professor of chemistry at the Bohemian University in Prague, Czech Republic, who determined accurate atomic weights. He determined that the value for tellurium was actually greater than that of iodine. This pointed out that the periodic table should truly be based on chemical properties rather than solely on atomic weights. From his atomic weight determinations he correctly placed lanthanum (which Mendeleev had mislocated in the periodic table). He suspected from spectroscopic studies that didymia was actually a mixture of rare earths.
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