"The table of Mendeleeff was changed but little for thirty years. Its anomalies, as the omission of hydrogen and the rejection of the atomic weight as the deciding factor in such cases as cobalt and nickel, tellurium and iodine, etc., were recognized; but greater knowledge was needed before these could be explained or the underlying law grasped."
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Francis Preston Venable, History of Chemistry (1922) p.85-86
https://en.wikiquote.org/wiki/Dmitri_Mendeleev
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Dmitri Mendeleev
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