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  4. Dmitri Mendeleev
  5. We must expect the discovery of many as yet unknown...

We must expect the discovery of many as yet unknown elements-for example, elements analogous to aluminum and silicon- whose atomic weight would be between 65 and 75.

Dmitri Mendeleev
Discovery, Example, Would Be
We must expect the discovery of many as yet unknown elements-for example, elements analogous to aluminum and silicon- whose atomic weight would be between 65 and 75.