Explain the features of Mendeleev's periodic table.

Explain the features of Mendeleev's periodic table.

Ans. Main features of Mendeleev’s periodic table are as follows :

1. The horizontal rows in the periodic table are called periods. There are seven periods. These are numbered from 1 to 7.

2. Properties of elements in a particular period show regular gradation from left to right.

3. Vertical columns in the periodic table are called groups. There are eight groups numbered from I to VIII. Groups I to VII are further divided into A and B subgroups.