hi..

Mendeleev’s periodic table is, more accepted for its originality and boldness in making corrections in the properties and predicting unknown elements.

1. Mendeleev was the first one to establish a systematic arrangement and bring out the periodicity of properties of elements with atomic weight and propose a periodic law.
2. It could point out the incorrect atomic weight of some elements known at that time.
3. It could predict the existence of other elements and could predict their properties so, as to leave space in the periodic table.
4. It could accommodate all the sixty elements discovered at that time and could accommodate the noble gases which, where discovered later.

Disadvantages : He couldn't allocate a correct position to hydrogen. Atomic masses didn't increase in a regular manner, so it was impossible to predict how many elements could be discovered between two elements.

Dear Aspirant

Advantage-

1.He left blank  Places which help scientist to discover new element

2.When Noble gasses was discovered Hel could add  it to periodic table without any major changle

3.He predicted the property of new element

Disadvantages -

1. Couldn't explain position of Hydrogen

2.Couldn't answer the question "Can we have an element with atomic mass 3 between Hydrogen and Helium

3 He placed cobalt before Nickel though Cobalt has more mass

I hope it will help you

Thank you