Final answer:
Mendeleev accurately predicted the properties of an unknown element between silicon and tin in the periodic table, which was later discovered and named germanium.
Step-by-step explanation:
The subject of this question is Chemistry.
Mendeleev accurately predicted the properties of an unknown element that is located between silicon and tin in the periodic table. This element was later discovered and named germanium. Mendeleev's prediction of this element provided strong evidence for the accuracy of his periodic table.
Keywords: Chemistry, unknown element, predicted properties, periodic table, silicon, tin, Mendeleev, germanium