Question

what are the main features of mendeleevs classification​

Answer 1

The Mendeleef periodic table is composed of seven horizontal rows or periods and is numbered between 1 to 7. There is a regular gradation in the properties of elements in the horizontal rows(periods) from left to right. The periodic table is composed of eight vertical columns or groups. They are numbered between 1 to 8.

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Answer 2

Explanation:

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