Question

With respect to the merits of Mendeleev's periodic table answer the following question.

Give the name of eka-boron and eka-aluminium.

Answer 1

1. In Mendeleev, periodic table elements were arranged based on increasing atomic mass. During Mendeleev, only 63 elements were known so after studying the properties of elements he arranged them into vertical columns called groups and horizontal rows are called periods.'
2. When Mendeleev made his periodic table, he realized that many elements are not known at that time and yet to be discovered. So, left gaps in his periodic table for such elements and also predicted their properties.
3. Eka-boron was the name given by Mendeleev to the undiscovered element which is now known as Scandium.
4. Eka-aluminium was the name given by Mendeleev to the undiscovered element which is now known as Gallium.