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)

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

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aluminum atomic discovery example expect silicon unknown weight yet elements

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