Name two elements whose properties were predicted on the basis of their positions in Mendeleev’s periodic table.

What was the Mendeleev’s basis for the classification of elements ?

In the classification of the then known elements, Mendeleev was guided by two factors. What are those two factors ?

The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka- boron, eka-aluminium and eka – silicon. What names were given to these elements when they were discovered later on ?

Name two elements whose properties were predicted on the basic of their positions in Mendeleev’s periodic table.