State any two points of Mendeleev.s basis for classification of elements ?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Mendeleev's Classification**: Mendeleev was a scientist who developed a systematic way to classify elements based on their properties. His approach laid the foundation for the modern periodic table.

2. **First Point - Similarities in Chemical Properties**: One of the key points in Mendeleev's classification was that elements with similar chemical properties were grouped together. This means that elements that reacted similarly or had similar behaviors in chemical reactions were placed in the same group or column in the periodic table.

3. **Second Point - Increasing Order of Atomic Weights**: Another important aspect of Mendeleev's classification was that he arranged the elements in order of increasing atomic weights. This means that as you move from left to right across the periodic table, the atomic weight of the elements increases.

...