The 3 elements which were predicted by Mendeleev for which the left blank spaces in the periodic table.

Which is the first element in the periodic table ?

Name the element having the simplest atomic structure in the periodic table.

Which is the incomplete period in the Moders periodic table?

What are f-block elements? Where are they placed in the periodic table?

State the merits of Mendeleev's periodic table.

Distinguish between: Mendeleev's periodic table and Modern periodic table

The element eka-boron in Mendeleev's periodic table is known as_____in the Modern periodic table

What are the demerits of Mendeleev's periodic table?

Merits of Modern periodic table over Mendeleev's periodic table

Mendeleev predicted the existence of certain elements not know at that time. He named two of these elements as eka-aluminium and eka-silicon. a. Name the elements which have taken the place of these elements. b. Mention the group and period of these elements in the modern periodic table. c. Which one of these two elements is a metalloid? d. How many valence electrons are present in eka-silicon? e. Eka-aluminium forms a chloride. What is its formula?