When Mendeleev created his periodic table, he left gaps for unknown elements with properties appropriate to the gaps. He gave them provisional names using the prefixes from Sanskrit, eka, dvi, and tri.
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The elements of scandium, gallium, technetium and germanium are among those that have come to fill the gaps on Mendeleev's table.
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Mendeleev predicted the existance of protractinium in 1871; it was officially named in 1949.