Question

when was Mendeleev's periodic table discovered??
what is the achievements and limitations of it ?​

Answer 1

Answer:

Hey mate here is your answer...

Achievements of Mendeleev's periodic table are:

1. He pridicted the existence of some elements that had not be discovered at that time.
2. His periodic table could predict the properties of several elements on the basis of thier position in the periodic table.
3. His periodic table could accomodate noble gases when they were discovered.

Limitations of Mendeleev classification :

1. The position of isotopes could not be explained.
2. Wrong order of atomic masses of some elements could be explained.
3. A correct position could not be assingned to Hydrogen in the periodic table.

Explanation:

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Answer 2

In 1863, there were 56 known elements with a new element being discovered at a rate of approximately one per year.
John Newlands described a Law of Octaves, noting their periodicity according to relative atomic weight in 1864, publishing it in 1865. His proposal identified the potential for new elements such as germanium.

The concept was criticized and his innovation was not recognized by the Society of Chemists until 1887.
Another person to propose a periodic table was Lothar Meyer, who published a paper in 1864 describing 28 elements classified by their valence, but with no predictions of new elements.
On 6 March 1869, he made a formal presentation to the Russian Chemical Society, titled The Dependence between the Properties of the Atomic Weights of the Elements, which described elements according to both atomic weight (now called relative atomic mass) and valence.

He is referred as Father Of Periodic Table