Assertion: hafnium | /r/HasProperty | found around zirconium ores
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text: my understanding of it, from Richard Rhodes' book on the atomic bomb, is that Bohr elaborated his theory of electron shells, connected that up with the periodic table, and predicted hafnium would be found around zirconium ores, at which point de Hevesy et al started looking for it, and then found it just before Bohr's Nobel acceptance speech.