Question 3 (multiple choice): Mendeleev's table had gaps that turned out to be brilliant predictions. Which element, discovered in 1875, filled one of those gaps and matched his predictions closely — he'd even named the missing spot "eka-aluminum"? A) Gallium B) Germanium C) Scandium D) Technetium
Chemistry
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A
Gallium
The correct answer is A) Gallium.
Mendeleev predicted the existence and properties of several elements before their discovery. He named the missing element below aluminum "eka-aluminum." Gallium was discovered by Paul-Émile Lecoq de Boisbaudran in 1875, and its properties matched Mendeleev's predictions for eka-aluminum almost perfectly.
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