Germanium

Germanium is an element discovered by analyzing a silver ore, which filled the gap predicted by Mendeleyev as eka-silicon. Its properties matched those predicted, validating Mendeleyev's periodic table.
 Clemens Alexander Winkler Germany 1886 Germanium

Germanium is an element discovered by analyzing a silver ore, which filled the gap predicted by Mendeleyev as eka-silicon. Its properties matched those predicted, validating Mendeleyev's periodic table.