Question

features of mendeleev's periodic table

Answer 1

Mendeleev arranged the elements in horizontal rows (known as periods) in the increasing order of their atomic masses. Each vertical column (called groups) contained elements of similar properties. The main features of Mendeleev's periodic table are: Groups and sub-groups: There are eight groups (I to VIII).

Answer 2

1) Mendeleev's periodic law predicted the existence of some elements that had not been discovered at that time.
2) Mendeleev's periodic law could predict the properties of several elements on the basis of their positions in the periodic table.
3) Mendeleev's periodic table could accommodate noble gases when they were discovered.