In 1869, Mendeleev left empty cells in the table and predicted that there would still be unknown elements: aka-aluminum, aka-silicon and aka-boron.
They were found: gallium (1875), germanium (1886) and scandium.
History of mankind.
In 1869, Mendeleev left empty cells in the table and predicted that there would still be unknown elements: aka-aluminum, aka-silicon and aka-boron.
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