Mendeleev proposed the existence of an unknown element that he called eka-aluminum. This element is now called
A) gallium.
B) silicon.
C) magnesium.
D) boron.
E) germanium.

Question

Quizplus · Accepted Answer

Gallium is the element that Mendeleev predicted as eka-aluminum. Its properties were very close to what Mendeleev had predicted and it was discovered in 1875, about a decade after Mendeleev's proposal.

Mendeleev Proposed the Existence of an Unknown Element That He