Eka-aluminium was later named as the metal __________ in the modern periodic table.
Gallium
Dmitri Mendeleev used the prefix "eka" to label elements he predicted would fill gaps in his periodic table, each sitting one row below a known analogue. Eka-aluminium occupied the slot directly below aluminium in Group 13. The element discovered by Paul-Émile Lecoq de Boisbaudran in 1875, matching Mendeleev's predicted mass and density for that slot, is Gallium. (Eka-boron corresponds to Scandium, and Eka-silicon corresponds to Germanium.)
Hence, Gallium.
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