Question

Mendeleev periodic table is not only having the defects but also is an example of a achievement justify​

Answer 1

Explanation:

Achievements:

1. It had periods and groups

2. The sequence was inverted so that elements with similar chemical properties can be grouped together.

3. He predicted the coming of new elements which were not discovered at that time.

Limitations:

1. Hydrogen didn't have a fixed position.

2. isotopes were discovered later and posed a challenge.

3. The atomic mass of elements was not increasing in a regular manner.

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