What element was one of the "holes" in Mendeleev's periodic table?
A)Si
B)Ge
C)Sn
D)Pb

Question

Quizplus · Accepted Answer

When Mendeleev first published his periodic table, there were several gaps in it where he predicted that elements should exist but had not yet been discovered. One of these gaps was located beneath silicon (Si) and above tin (Sn), in the same group as carbon (C) and silicon. The element that eventually filled this gap was germanium (Ge), which was discovered in 1886, just 15 years after Mendeleev's table was published.

What Element Was One of the "Holes" in Mendeleev's Periodic