Question

Wht is the achievements and drawbacks of modern perodic table

Answer 1

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

Answer 2

not fixed place for hydrogen

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