Solution:
The element that found a place later in the gaps left in Mendeleev's Periodic Table for the elements to be discovered later is germanium.The elements were arranged in the increasing order of atomic masses in horizontal rows known as periods in Mendeleev's Periodic Table. The elements have similar properties and fall in the same vertical column known as groups. He classified 63 elements which considered. He left a few spots for the elements to be discovered later. Germanium was one such that was found later and placed in the gaps he left. The properties of the element were quite similar to what Mendeleev predicted.
