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. mendeleev used the prefixes eka, dvi, and tri (sanskrit for one, two, and three) for undiscovered elements to signify how many places down from a known element in the same group they would have to be positioned in his periodic table. he thus predicted the existence of eka-boron (scandium), eka-manganese
(technetium), and dvi-manganese (rhenium), among others. gallium is not found in its element form in nature and occurs as a trace element in coal, bauxite, and other minerals. it is generally obtained as a secondary product while processing bauxite. discovery in , four years after mendeleev predicted...
https://chemindigest.com/gallium-the-smart-metal/