Question

why mendeleev left some gaps in periodic table​

Answer 1

Answer:

Mendeleev left gaps in his table to place elements not known at the time. By looking at the chemical properties and physical properties of the elements next to a gap, he could also predict the properties of these undiscovered elements.

Answer 2

Answer:

Mendeleev left cabs in his table to place elements not known at the time by looking at the chemical properties and physical properties of the elements next to a gap he could also protect the properties of these undiscovered elements....... the element germanium was discovered later